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Core Strength For Dummies®

Table of Contents

Introduction

About This Book

Conventions Used in This Book

What You’re Not to Read

Foolish Assumptions

How This Book Is Organized

Part I: Core Basics

Part II: Core Workouts to Help You Sculpt Your Trouble Areas

Part III: Developing Core Strength Using Accessories

Part IV: Adding Variety to Your Core Routine

Part V: Special Situations

Part VI: The Part of Tens

Icons Used in This Book

Where to Go from Here

Part I: Core Basics

Chapter 1: Finding Your Core Strength

First Things First: Locating Your Core

The Five W’s of Core Training

Who needs core training?

What can I do to acquire core strength?

Where is the best place to work out to get a stronger core?

When should I do core training?

Why should I strengthen my core?

The How’s of Core Strengthening

How often should I exercise to strengthen my core?

How long should I exercise each time I work out my core?

How intense should the exercise feel?

Should I see a doctor before I begin a core-strengthening program?

Benefits to Core Training

Overall benefits

Weight(less) benefits

Added physical and mental bonuses

Useful and Fun Techniques for Developing Core Strength

Yoga

Pilates

Wii Fit

Training with a partner

Got Skills? Get Core Strength

Running and hiking

Racquet sports

Basketball

Football

Swimming

Skiing

Soccer

Cycling

Gymnastics

Step aerobics

Weight lifting

Walking

Using Exercise Balls to Build Core Strength

Using core exercise balls at the gym

Using core exercise balls at home

Best core exercises to do with the exercise ball

Chapter 2: Reshaping Your Core

Rounding Up Your Core Muscles

Checking out your core muscles

What is core stabilization and where can I get some?

My favorite core stabilizers

Uncovering Key Core Principles

Breathing with Core Muscles for Better Results

Testing Your Core Strength

Getting what you need to test your core

Using your results to design a program

T-raises: Testing your upper back and chest

Seated core rotation: Testing the trunk or midsection

Back and butt extensions: Testing the buttocks

Chapter 3: Getting Started: Your Core Guidelines

Finding Your Fitness Level

Determining whether you’re ready to begin

Figuring out where to start

Picking Up Pointers for Your Level of Fitness

Beginners

Intermediate

Advanced

Getting Your Muscles to Chill Out

Benefits of Stretching Your Core (or Anything, for That Matter)

Beats stress

Gives you great posture

Increases your range of motion

Prevents injuries

Stretching Do’s and Don’ts

Do stretch after your workout

Do stretch a little bit every other day

Do hold each stretch

Don’t stretch to the point of pain

Do start at the top of the body and work your way down

Chapter 4: Things to Consider Before Taking the Core Challenge

Tuning In to Toning-Up Basics

Turning up the heat of your core

Knowing your limits

Setting aside enough time for working out

Keeping core safety in mind

Using a mat

Using a mirror

Warming Up Your Core

Jogging in place

Marching it out

Jumping rope

Holding Your Posture

Achieving a neutral spine

Finding your “hard to find” neutral spine

Knowing how a neutral spine feels

How Weights Can Build a Stronger Core

Dumbbells

Heavy balls (medicine balls)

No weights

Trying a Core Class

Part II: Core Workouts to Help Sculpt Your Trouble Areas

Chapter 5: Getting Started with Beginner Core Exercises

Using Everyday Ways to Work Your Core

Easing into It: Lowering to the Ground for Core Strengtheners

Lying pelvic tilts

Hip lifts with knees together

Suiting Up Your Core

Crunches

Side crunch

Side planks

Bicycles

Push-ups on knees

Baby Got Back!

Back extensions

Plank

Chapter 6: Getting That Six-Pack: Abdominal Core Superset

Shaping Up with a Superset

Supersets: How they are different from a regular workout

Benefits of doing a superset

Shooting for a Six-Pack

What to do to get a six-pack

What not to do to get a six-pack

Crunch It! Abdominal Workout

Crunches — feet on floor

Double-crunch — knees to elbows

Bicycle crunches

Reverse crunches

Legs straight up crunches

Side plank

Side-lying crunch

Half-up twists

Plank leg lifts

Superman — opposite arm and leg extension

Chapter 7: Core Workout for a Better Butt

Getting Some Junk in Your Trunk

Breaking Down Your “Butt”

My Core Secrets Workout

Squats — half up, half down

Reverse lunges — half up, half down

Plank leg lifts

Side lunge, left and right

Lunges — half up, half down

Bridge

Bridge with knees together

Chapter 8: Putting It All Together

Core Secrets to Looking Better Shirtless

Maintaining the “S” Position or Neutral Spine

Total Core Workout

On your back core series

On-your-tummy core series

Cooling Down After Heating Up

Part III: Developing Core Strength Using Accessories

Chapter 9: Challenging Your Core on the Ball

Finding a Ball That Fits

Sizing up the ball by using your height

Sizing up the ball as if it were a chair

Sizing up the ball by lying on it

Getting a feel for sitting on the ball

Finding the Perfect Spot for Exercising on the Ball

Picking the right space

Searching for the best surface

The Big Easy Core Ball Workout

Bridge pose

Bridge lift with calves on ball — straight legs

Ball push-ups

Core leg lifts

Single-leg bridge

Core extension

Core flexion

Hitting Crunch Time

Sit-ups

Oblique crunches

Rollaways

Abdominal curls

Ball exchange

Chapter 10: Adding Weights for Core Strength

Weight Guidelines

Picking the right amount of weight for you

Importance of increasing repetitions and sets

Plopping Down on a Weight Bench or Having a Ball

Dumbbell Workout for a Flat Tummy and Tiny Waist

The wood chop

Dumbbell bent-over row

Crunches with weights

Dead lifts

T-Raises

Squat to overhead press

Reverse lunges with weights

Ab Central Machines

Ab roller

Ab board

Ab wheel . . . yikes!

Part IV: Adding Variety to Your Core Routine

Chapter 11: Pilates Core Program

Getting Primed on the Principles of Pilates

Using Pilates for Core Training

Preparing for Core Training the Pilates Way

Getting the Pilates stuff you need

Unveiling the path to a neutral spine

Breathing the Pilates way

Trying Out Beginner Pilates Core Care

Pilates bridge

The plank

Roll downs

Swimming

The hundred

Single-leg stretch

Rising swan

Side kicks

Chapter 12: Yoga Core

Benefits of Doing Yoga

Taking It Slowly and Breathing

Strong Core Poses

Downward dog

Plank

Cobra

Stretchy and Sticky Core Poses

Cat/Cow

Forward bend

Child’s pose

Corpse pose

Taking In My Favorite Abs Tightener: Sun Salutation

Standing position

Arms raised overhead

Forward bend

Step back lunge position

Plank position

Inchworm

Cobra position

Downward dog

Lunge position

Forward bend

Arms raised overhead

Prayer position

Putting the poses together

Chapter 13: Working Your Core While Exercising Other Muscles

Visualizing Working Muscles

Targeted upper-body muscles

Targeted lower-body muscles

Refresher for Using Proper Form with Weights

Recruiting Your Upper Body for Core

Biceps curls

Alternating biceps curls

Triceps press

Triceps kickbacks

Hammer curls

Bent-over rows

Body Resistance Core Series

Dips off a table

Push-ups off a table

Squats

Walking lunges

Chapter 14: Core Stretches to Help Whittle Your Middle

What to Do and What Not to Do

Abs and Back Core Stretch Series

Back extension

Step back and reach

Side reach

Lying spinal rotation

Spinal rotation

Part V: Special Situations

Chapter 15: Pregnancy Moves for Your Core

Keeping a Strong Core with a Growing Belly

Kicking In Cardio for All Nine Months

Walking

Swimming

Moving

Easing Discomfort with Core Moves

Cat/cow

Hip extension or kneeling bird/dog

Modified side plank

Strengthening Your Stance with Standing Floor Moves

Side lunge

Relieving Tight Muscles with Releasing

Pregnancy core stretch

Chapter 16: New Mommy and Me Core Workout

Do’s and Don’ts for New Moms

Do

Don’t

Kick-Starting Your Fitness Slowly with Kegels

Warming Up to Your New Mom Workout

Lying pelvic tilt

Beginning side plank

Postpartum bridge

Bicycle

Crunch (postpartum)

Push-up on knees

Mommy and Me Moves: Fun Stuff to Do with Your Baby

Baby hip bridge

Crunch with baby

Reverse crunch with baby

Plank with baby

Lunge with baby in carrier

Plie squat with baby

Squat with baby

Chapter 17: Exercises for Kids to Help Build Core Strength

Getting the Facts on Kids’ Fitness

Taking in Some Tips on Working Out with Your Kid

Working Your Kid’s Core

Froggy jumps

Jumping jacks

Push-ups on knees

Bicycles

Pairing Up for Exercise — Family Style

Ball passing

Sit-ups: holding feet

Chapter 18: Seniors Taking the Core Challenge

Protecting Yourself with Exercise As You Age

Exercising Safely As a Senior

Tuning In to Training Guidelines for Seniors

Core Routine to Help Maintain Balance

Hip extension

Hip flexion

Side leg raises

Standing core release

Seated Core Routine for Strong Abs

Seated sit-up

Seated core rotation

Seated core stretch

Part VI: The Part of Tens

Chapter 19: Ten Best Ways to Train Your Core

Balance It

Crunch It

Fix It with Cardio

Stretch It Out

Walk It Out

Cycle Through It

Plank It

Lengthen It

Suck It In

Twist It

Chapter 20: Ten Core-Conscious Dietary Changes You Can Easily Make

Reduce Fatty Foods

Cut Back on Carbs

Eat Lean Protein

Say Bye-Bye to Dairy

Drink Fewer Margaritas

Just Say “No” to Sugary Soft Drinks

Eat More Salads

Don’t Eat after 7 p.m.

Snack on Fewer Salty Foods and More Fat-Free Pudding

Drink Lots of H2O

Chapter 21: Ten Household Items You Can Use to Help Improve Core Strength

A Chair from Your Kitchen

A Beam or Rafter in Your House

Your Coffee Table in the Living Room

Your Desk in Your Home Office

A Doorway in Your Bathroom

Water Jugs in Your Kitchen

A Towel in Your Bathroom

The Steps in Your House

A Wall in Your House

A Book Lying on Your Nightstand

Chapter 22: Ten Favorite Moves

Back Extensions

Plank

Abdominal Crunch

Double Crunch

Oblique Crunches

Half-Up Twists

Bicycle Crunches

Reverse Crunches

Plank Leg Lifts

Superman — Opposite Arm and Leg Extension

Core Strength For Dummies®

by LaReine Chabut

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About the Author

LaReine Chabut is a fitness and lifestyle expert, model, and mom, as well as the author of Exercise Balls For Dummies (Wiley), Lose That Baby Fat! (M.Evans) and Stretching For Dummies (Wiley). LaReine is a leading contributing fitness expert for Shape and Fit Pregnancy magazines and is most recognized as the lead instructor for America’s number one exercise video series The Firm (with more than three million copies sold worldwide). She has graced the covers of such high-profile magazines as Shape, Health, New Body, and Runner’s World, and has recently appeared on Dr. Phil, Chelsea Lately on E!, CNN, ABC, FOX News, EXTRA, Access Hollywood, Good Day LA, and KABC.

LaReine and her Lose That Baby Fat programs can be found at www.podfitness.com/lareinechabut, where she is a premier trainer for iPods, along with Kathy Smith, David Kirsch, and other top trainers in their field.

As an actress, LaReine penned a sitcom with Meg Ryan entitled Below the Radar for the Fox Network and Castle Rock Entertainment. She has co-written and starred in two short films: Separation Anxiety, which broadcast on Lifetime Television, and Good Jill Hunting, which aired on the Sundance Channel. Her series regular and guest-starring appearances include Dr. Phil, Chelsea Lately, Linc’s, Nash Bridges, The Secret World of Alex Mack, USA High, The Single Guy, Strange Luck, Murder She Wrote, and Quantum Leap, to name a few.

To read more about LaReine, log on to her Web site at www.lareinechabut.com or www.losethatbabyfat.com.

Dedication

This book is dedicated with lots of love to my daughters, Bella and Sofia, who compete for my attention every time I sit down at my desk to write! I do love you both so much . . . and of course to the readers who make it all worth it and buy my books. I thank you all!

Author’s Acknowledgments

Writing a book requires a lot of teamwork and, again, I have to thank Rob Dyer at Wiley for encouraging me to write my first book. Who would ever guess that this would be my fourth? Thanks, Rob!

I’d also like to thank the entire staff at Wiley, including Jennifer Connolly, my project editor, who was just great to work with and a busy mom like myself (I could tell by the noise in the background, she started working from home!). Lindsay Lefevere, acquisitions editor, really is good at what she does and was always there for me when I needed her. Krista Hansing, my copy editor, who made everything look nice and consistent and encouraged me to use spell check! My agent at ICM, Andrea Barvzi, to be able to convince me to write a book in a few months! And photographer Nick Horne sat on an exercise ball as he shot the photos and still managed to make me look good. Make-up artist Mina Kang made me look really tan, which is always nice. And last, but certainly not least, Linda Shelton was on my first cover shoot for Shape magazine and served as director for this shoot — thanks, Linda, you really are the best!!

Special thanks to all the models who look so hot! Robert Check is shirtless in all the pictures in this book, and when you see him, you’ll know why (thanks to his agent, David Levine, for bringing him to my attention:). Chris Gann took time off from shooting a film to do the shots in Chapters 8 and 10 and filled in as my senior model. And, of course, my beautiful daughter, Bella, and her friend Elizabeth Bartle-Steere did the kids’ exercises for me. Last but certainly not least, baby Sofia Gallachi was the best baby I’ve ever worked with — and never made a peep!

Publisher’s Acknowledgments

We’re proud of this book; please send us your comments through our online registration form located at http://dummies.custhelp.com. For other comments, please contact our Customer Care Department within the U.S. at 877-762-2974, outside the U.S. at 317-572-3993, or fax 317-572-4002.

Some of the people who helped bring this book to market include the following:

Acquisitions, Editorial, and Media Development

Project Editor: Jennifer Connolly

Acquisitions Editor: Lynsey Lefevere

Copy Editor: Krista Hansing

Technical Editor: Damon Faust

Senior Editorial Manager: Jennifer Ehrlich

Editorial Supervisor and Reprint Editor: Carmen Krikorian

Editorial Assistants: Erin Calligan Mooney, Joe Niesen, Jennette ElNagger, and David Lutton

Cover Photo Credit:Nick Horne

Cartoons: Rich Tennant (www.the5thwave.com)

Composition Services

Project Coordinator: Lynsey Stanford

Layout and Graphics: Stacie Brooks, Reuben W. Davis, Sarah Philippart, Christine Williams

Proofreaders: Jessica Kramer, Christine Sabooni

Indexer: Ty Koontz

Special Help: Sharon Perkins, Alicia South

Publishing and Editorial for Consumer Dummies

Diane Graves Steele, Vice President and Publisher, Consumer Dummies

Kristin Ferguson-Wagstaffe, Product Development Director, Consumer Dummies

Ensley Eikenburg, Associate Publisher, Travel

Kelly Regan, Editorial Director, Travel

Publishing for Technology Dummies

Andy Cummings, Vice President and Publisher, Dummies Technology/General User

Composition Services

Gerry Fahey, Vice President of Production Services

Debbie Stailey, Director of Composition Services

Introduction

Core training is a hot topic these days, isn’t it? Just take a look at any magazine or DVD — they all seem to be targeting your core. Yes, having a strong core not only prevents injuries, but it also makes the movements you make on a daily basis easier to manage. So what is core strength and how do you get it? Well, I think it is best described as having fat-free abs and a strong back. I describe the core itself as the “bridge” that connects your upper and lower body. So if you have a weak bridge, all your movements will suffer because nothing will make it across that bridge.

Some people call it core training because you’re doing just that — increasing the strength in your midsection as you’re whittling your waist and developing strong back muscles. Just think of how often you call upon your core to perform movements throughout the day: getting up from your couch or a chair, picking up your children or grandchildren, and sitting at your desk while you’re working. All these activities require great core strength — otherwise, you’d walk around hunched over with weak back muscles all day long. Sound familiar? I hope not! I want to show you how to obtain a stronger core with this book and help you gain a better understanding of why it’s so important to have a strong core in the first place!

About This Book

This book introduces you to various core exercises that everybody can do — no matter what your age or lifestyle. In fact, there’s a chapter for everybody in this book — from kids to seniors — that can help you develop a regular core-training routine to do every day or just learn a few new moves to keep you feeling great! I’ve included Pilates and yoga workouts, children’s exercises, senior exercises, workouts for new moms and babies, weight training for your core, and more. You’ll also discover how to stave off workout boredom by adding a few new props, such as the exercise ball and dumbbells. In addition, I cover simple core strengtheners you can do using household objects or the resistance of your own body weight.

This book contains comprehensive sections on special circumstances, like exercising during pregnancy and relieving back pain by targeting your abdominals. I even include a total core workout you can do when you have enough time and aren’t rushed to work out. Whatever your interest or age, you’re sure to get a good core workout and have some fun doing it!

In this book, I tell you everything you need to know about core training, such as answers to the following questions:

What muscles am I targeting when I’m strengthening my core?

What kind of changes can I expect to see in my body from core training?

How many days a week should I do these core workouts?

Is it safe to exercise during pregnancy?

What are the best core strengtheners I can do for back pain?

Can kids strengthen their core, too?

Can I stretch out my core?

Is it safe for senior citizens to exercise?

Are there core exercises I can do on the exercise ball?

Will the core workouts be a challenging enough for me if I’m already in shape?

In addition, this book, like all For Dummies books, has a friendly and approachable tone that assumes you don’t know a whole lot about the subject you’re reading — not that you’re an actual dummy! It’s also important to tell you that like all For Dummies books, you don’t have to read it cover to cover . . . instead just flip to the section that best describes you or read a little intro first before moving onto whatever interests you. This book is also useful for learning new core-training techniques for those who already know what they’re doing. You can always pick up new techniques from a For Dummies book!

Conventions Used in This Book

The focus of this book is on core strengthening in many different situations, while emphasizing safety and proper body alignment. Reading the step-by-step instructions that accompany the photos before you start any of the exercises makes trying these core moves a lot easier and helps to keep your workouts safe and effective.

Check out these conventions I used to make navigating the information in this book a lot easier:

Most of the core exercise photos show two stages — labeled A and B — demonstrating the beginning and end for each pose.

I use italics to point out any new terms or bits of jargon you should know.

Web sites and e-mail addresses appear in monofont to help them stand out.

The numbered sets of instructions for the core exercises and the keywords in lists appear in boldface.

What You’re Not to Read

Although I feel that all the information in this book is important, the sidebars that appear in the gray boxes don’t contain information that you absolutely need to know to get a good core workout. However, these sidebars do contain great tips and information about your health, so I encourage you to read them at some point.

Foolish Assumptions

As I mentioned earlier in the introduction, this book is for people who don’t have a lot of prior knowledge about the subject at hand (in this case, core training and your current level of fitness). Keeping this goal in mind, I made a few assumptions about you, the reader:

You’re interested in core strengthening and want to make it part of your life.

You don’t have much experience with core exercises and want to know more.

You’re ready, willing, and able to find out more about core training and how to do the exercises in this book.

If this sounds like you, then you’ve come to the right place!

How This Book Is Organized

Core Strength For Dummies is divided into six different parts, each one with a unique focus. You can go directly to whichever part interests you the most or start at the beginning to gather some information and a checklist of what you’ll need to know before you begin each core-strengthening chapter. Following are the parts and what you can find in them.

Part I: Core Basics

If you’re new to core training, reading Part I is the way to go. Part I covers all the important issues you want to know before you begin your core program.

Part I covers these topics:

Who should exercise their core

How often you should be working your core

How you can reshape your core

Props you can use to enhance core exercises

The benefits of a strong core

Part II: Core Workouts to Help You Sculpt Your Trouble Areas

Part II is organized in a very logical manner — Chapter 5 starts off with a series of beginning exercises, and then the chapters progress with core exercises that are illustrated for various individual body parts. Finally, Chapter 8 finishes with a total body workout to strengthen your entire body.

Because I believe you should work out in a progressive manner (starting with the simplest exercises first), I strongly encourage starting with the beginner exercises in Chapter 5 and then progressing through the chapters until you reach Chapter 8. These chapters concentrate first on the abdominals and then on the butt; finally, you put it all together for a total body workout focusing on your core.

Part III: Developing Core Strength Using Accessories

Part III shows you a variety of core exercises you can do while using accessories. This section may be the most useful part of the book for you if you already have knowledge of core training and want to beat boredom by adding a few new techniques or a few new moves.

In Chapter 9, I show you core exercises using an exercise ball and offer you a ball chart so you know how to pick the right size of ball. Chapter 10 contains core exercises using dumbbells that you can add to any workout you already have or just use alone for core strengthening.

This part ends with nice primer on ab machines that you can use at your gym to get a nice six-pack!

Part IV: Adding Variety to Your Core Routine

Part IV is a fantastic section on recruiting different training techniques to help with core strengthening. If you’ve ever wanted to try Pilates, Chapter 11 is the one for you. This chapter contains photo illustrations of Pilates strengthening exercises that help you get a killer core.

Chapter 12 is a chapter for anyone interested in yoga — and you’ll love doing the poses! Whether you’re a beginner or you know all about the sun salutation, you’ll like trying these poses that place a special emphasis on your core.

Part IV also contains Chapter 14, for stretching your core. It shows some fun and practical stretches for the abs, hips, and back that’ll help keep you strong and flexible for years to come.

Part V: Special Situations

No matter what stage of life you’re in, core exercises can improve your daily life. Check out Chapter 15 for pregnancy and postnatal core exercises that help you to relax and strenghten your body before and after you have your baby. Get the kids together to perform a series of fun exercises that Chapter 16 provides, which help your kids build basic core strength and learn the skills needed to stay fit for a lifetime. And finally, Chapter 18 contains core exercises that address the needs of anyone over the age of 60. If you’re in one of these demographics, this part has something for you!

Part VI: The Part of Tens

In every For Dummies book, you find The Part of Tens. The last three chapters in this book contain top-ten lists of fun facts about the different things you’ll get from core training and what you can use to enhance your workout at home.

Chapter 19 lists ten best ways to train your core, while in Chapter 20, I offer ten dietary changes you can make to whittle your core and get fat free abs. Finally, Chapter 21 offers ten different items you can use in your house to make core strengthening fast and fun!

Icons Used in This Book

In this book, you’ll find different pictures in the margins, or icons, that give you useful information along the way. Reading these icons before you try the actual exercises is helpful because many of them suggest easier or better ways of performing each one.

Here’s a list of icons used in this book:

Tip.eps The Tip icon gives you useful information that’ll make your life easier as it relates to core training. I may point you to a specific chapter or resource, or provide hints to modify an exercise or to make it easier. For instance, a Tip icon may tell you how to breathe during an exercise to keep you from holding your breath, or it may tell you to maintain a neutral spine.

Remember.eps As you may have guessed, this icon points out really important information that you need to keep in mind. Very valuable information comes with these icons, so don’t skip ’em!

Warning(bomb).eps The Warning icon highlights information that keeps you from hurting yourself. Read the information listed under this icon before you attempt each exercise. You’ll be glad you did!

Where to Go from Here

Core Strength For Dummies is a reference guide for beginners and an introduction to performing core-strengthening exercises. You can start reading at the very beginning of this book to gather a little information first, or you can dive right in and tear out the yellow Cheat Sheet in the front of this book to take with you as you’re running out the door to a core class.

If you’re not sure where you want to start, I suggest browsing the table of contents to get a sense of exactly what this book covers and what topics interest you. You may find that you already know the basics but have always wanted to know how to use an exercise ball, so you can immediately flip to that chapter.

If you fall into one of the special circumstances groups, you may want to go directly to that section to find which chapter covers your special needs. If you’re like me, you may just want to go directly to the workout chapters that pertain to you and learn some new moves.

And if you know all about core training already and just want to brush up on your exercises a bit, you can turn to the index to find out which information pertains to you.

Wherever you choose to start, it’s great that you’re here. Enjoy!

Part I

Core Basics

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In this part . . .

I know that you know a strong core is good for you, but in Chapter 1, I cover why having a strong core is actually good for you. I also answer all the questions you may have about your core — like where it is located, why you need to strengthen it, and how to acquire core strength through specific exercises.

In Chapter 2, I get into the anatomy of your core a little bit, which will give you a better understanding of what muscles you’re working and which one’s you aren’t. I show you how to evaluate your core stability and test your present level of fitness so you’ll have a starting point for your new core-training program. I even help you understand what you can do to reshape your core to the best of your ability — with a little help from me.

Chapter 3 includes everything you need to know to get started, including what props you might want to use and how much space you’ll need. I also give you the basics of a safe core-training program, including guidelines for beginners and advanced exercisers.

I wrap it all up in Chapter 4, where I show you a few warm-ups to increase your core temperature and prepare your body for core training.