HIIT Your Limit

High-Intensity Interval Training for Fat Loss, Cardio, and Full Body Health

Len Kravitz

• Publisher: Apollo Publishers
• Year: 2018
• Print ISBN: 9781450468305
• eBook ISBN: 9781948062251
• Topic: Personal Development
• Subtopic: Personal Success

Get lean, build muscle, and stay healthy! A Fitness Hall of Fame inductee and world-famous exercise scientist explains high-intensity interval training and the nutrition that complements it, and provides a wealth of workouts, including workouts you can do at home, so you can get and keep the body you've always wanted.

High-intensity interval training (HIIT) is an extraordinarily effective form of training that mixes high- and low-impact activities during periods ranging from seconds to eight minutes. In HIIT Your Limit, Dr. Len Kravitz, a National Fitness Hall of Fame inductee and internationally-renowned exercise scientist for the past thirty-six years, explains what HIIT is and how it effects your entire body (externally and internally), gives 50 workouts and a plan to whip you into shape fast, and presents a wealth of nutritional and other advice to further its impact.

HIIT was recently rated the #1 new fitness trend by the American College of Sports Medicine and is the key to staying fit for celebrities like David Beckham, Britney Spears, Hugh Jackman, and Scarlett Johansson. In addition to fat loss, it's been proven to have major health benefits on blood pressure, diabetes, and cholesterol. Through this groundbreaking volume you'll learn why, and see how to get fit quick and have a fun and truly sustainable exercise program, no expensive personal trainer required.

Chapter 1

Exercise: The Quality of Life Super Pill

When I travel around the world I am often asked the same simple question: Why should I exercise? Let me explain it this way: Now more than ever, an abundance of evidence suggests that exercise is a super pill that is guaranteed to give its users a higher quality of life, needn’t cost a penny, and doesn’t come in a capsule. I will turn to my academic side to share with you the benefits of exercise, a topic I’ve written about extensively during my professional career.

Simply put, exercise and regular physical activity are considered a primary strategy for preventing, delaying, or combating numerous diseases. Interestingly, the importance of exercise for improving health was recognized by Hippocrates, the famous ancient Greek physician who wrote the following in the fifth century BC: “All parts of the body . . . if used in moderation and exercised in labors to which each is accustomed, become thereby healthy and well developed and age slowly; but if they are unused and left idle, they become liable to disease, defective in growth, and age quickly.” This ancient wisdom was validated in 2012, when the journal Comprehensive Physiology published one of the most comprehensive scientific reviews on the benefits of exercise yet. This paper confirmed that regular physical activity and exercise are a primary prevention for thirty-five chronic diseases and health conditions. Some of the major health conditions that regular physical activity may combat include the following: coronary heart disease, type 2 diabetes (including prediabetes and gestational diabetes), obesity, metabolic syndrome (a group of risk factors including high blood pressure, high blood sugar, unhealthy high triglyceride levels, and abdominal fat), peripheral artery disease, hypertension, stroke, congestive heart failure, osteoporosis, osteoarthritis, bone fracture (and falls), rheumatoid arthritis, colon cancer, breast cancer, endometrial (uterus) cancer, accelerated aging, nonalcoholic fatty liver disease, constipation, gallbladder diseases, deep vein thrombosis, cognitive dysfunction, and depression. Yes, exercise can battle all of these diseases. In a 2016 article in the British Journal of Sports Medicine, the authors declare that exercise is just good medicine. I totally agree. And yet, despite these wondrous health benefits, most people do not exercise. As a result, American society continues to face major health challenges. Let me continue this story.

Sitting Is the New Smoking Disease

The 2012 Comprehensive Physiology article highlighted the fact that 95% of adults in the United States do not meet the minimum guideline for physical activity, which, as explained earlier, is 150 minutes of somewhat hard exercise throughout the week. Why is it such a struggle for the majority of Americans to attain 30 minutes of somewhat hard physical activity at least 5 days per week? Some scientists explain that there has been a steep decline in physical activity during the last several decades due to our reliance on technology, including automobiles, computers, televisions, smartphones, tablets, and energy-saving devices. Our new technologies have advanced travel, communication, education, research, business, and medicine, but have also contributed to a massive spike in physical inactivity (what we scientists refer to as “sedentary behavior”). People in developed societies throughout the world are spending greater amounts of time in activities that not only limit physical activity, but also require prolonged sitting. Schools, homes, worksites, and public spaces are built in ways to minimize human movement and promote sitting. When it comes to health, many wellness professionals now claim excessive sitting is akin to the smoking disease of yesteryear for its long-term health consequences.

Life is motion; we are a species designed to regularly move. Movement is vital for health and optimal aging. Accordingly, inspiring you to move more is a major goal of this book, and my START MOVING NOW! program, which is based on articles I’ve written, will help you combat sedentary behavior. My goal for most people I work with is to move more during their waking day. The benefits of this kind of lifestyle change are plain—and supported by research. In fact, a June 2016 article in the journal Diabetes Care showed that people who break up their waking days with movement are likely to reduce the risk of diabetes and cardiovascular complications. I encourage you to start moving more every day, and keep moving for the rest of your sure-to-be-vibrant life.

A New Fitness Team Is Forming

The medical community is now beginning to work closely with fitness professionals to help encourage people to get physically active. For its part, the American College of Sports Medicine has developed a new medical campaign promoting physical activity and exercise known as Exercise is Medicine (EIM). EIM is an international health initiative that encourages healthcare providers and primary care physicians to include physical activity when prescribing treatment plans for their patients. Many of these primary care physicians also refer their patients to credentialed exercise programs and certified exercise professionals. This collaboration between the medical community and fitness pros sends an invaluable message to everyone, regardless of their age: start moving, keep moving, and make exercise an essential part of your daily life. Remember, “Inch by inch, it’s a cinch.”

Chapter 2

What Is High-Intensity Interval Training (HIIT)?

I am regularly invited to fitness conferences around the world to discuss the physiological merits of HIIT workouts and how to design HIIT programs. It is a big focus of my professional life, so I’d like to take this opportunity to explain it to you in more detail.

HIIT is a system of cardiovascular training that involves alternating between high- and light- intensity intervals of exercise of varying lengths of time. The high-intensity intervals (often referred to as work periods) may range from 5 seconds to 8 minutes long, and are performed at a self-regulated intensity ranging from comfortable-but-challenging to more challenging. The light-intensity intervals, called the recovery periods, are self-paced periods of exercise at a light-to-moderate intensity. When we speak of intensity, we are talking about the level of exercise exertion, or how hard you exercise. Each workout begins with a gradual warm-up that prepares the body for the following workout. This continues into the HIIT part of the workout, where alternating work and recovery intervals total a combined 10 to 20 minutes—or longer, if you are endurance-trained. Every HIIT workout concludes with a total body cooldown to return the body’s heart rate, breathing rate, blood flow, and temperature back to a pre-exercise level.

In the book introduction I stated that true HIIT workouts are cardiovascular workouts. All of the wonderful health, disease prevention, and fat loss benefits are based on these types of workouts. Plus, all of the workouts in this book are adapted from actual studies that show these fabulous outcomes. Please note that the word “high-intensity” is a buzzword in the fitness industry for any workout that is very challenging. There are countless high-intensity workouts in the fitness industry (such as boot camp and body blast), however not all of them are actual HIIT programs.

Why Is HIIT so Popular?

Recently, interest in HIIT has grown enormously due to the widespread popularity of exercise programs, including P90X, Insanity, and CrossFit, all of which include aspects of HIIT. Millions of exercise buffs have found that alternating hard-intensity intervals of exercise with light-­intensity intervals of recovery leads to enjoyable fitness gains in less time. In fact, in a 12-week 2017 study published in the Journal of Diabetes Research, it took obese sedentary women half the time to lose the same amount of body fat through HIIT training as it took them to lose it through traditional aerobic exercise. Another advantage of HIIT is the ease with which it can be modified for people of all fitness levels and health conditions. HIIT has generated a great deal of support with special populations, such as overweight individuals and those with clinical conditions like type 2 diabetes and cardiovascular disease. HIIT workouts can be performed with every kind of exercise modality, including cycling, walking, swimming, aqua training, elliptical striding, and in many group exercise classes. Also, HIIT workouts provide similar, and perhaps better, fitness benefits than continuous moderate-intensity aerobic workouts—what we call “steady-state workouts”—but in shorter periods of time.

Even more appealingly, HIIT workouts tend to burn more calories than traditional workouts, particularly after the workout; yes, that is correct—after the workout. Let me explain further. During the time period immediately following a workout, the body experiences an exercise “afterburn,” or excess post-exercise oxygen consumption (EPOC) in exercise science terms. That’s a mouthful, so let me put it in plain words. After every workout, your body’s muscles and major systems, such as cardiovascular and respiratory, are still revved up. As a result, it takes energy to recover from exercise, and EPOC represents the energy expenditure you utilize to restore your body after your workout. So as you gradually slow down your muscles and return your body systems to pre-exercise levels, you continue to burn additional calories. This EPOC period tends to peak for about a 2-hour period after an exercise workout, though it may last up to 14 hours or longer. That means your metabolism is actually boosted for 2 or more hours after your workout.

Harder intensity workouts lead to longer EPOC periods. That’s the impressive news about HIIT and EPOC, and why I wanted to highlight it here. Because of the dynamic nature of HIIT workouts, the EPOC periods tend to be longer than they are with traditional steady-state workouts. Therefore, HIIT workouts enable you to burn more calories. This additional calorie burn helps you achieve your weight management goals, which is another benefit of HIIT training highly praised by exercise aficionados.

Interestingly—and quite satisfyingly—during EPOC the body uses primarily fat to restore the body. So, a longer EPOC means the body is burning more fat after the workout, which is another plus from your HIIT workouts.

How Are HIIT Programs Developed?

When you develop a HIIT program, you must consider the intensity (how hard you are exercising), the interval time ratio (length of work interval in relation to length of recovery interval), the workout duration (length of workout), and workout frequency (how many times a week). When it comes to deciding on an intensity, I recommend you use a rating system based on your perceived exertion during your workouts. Ratings of perceived exertion is a self-paced way for you to select the appropriate exercise intensity, and it’s scientifically sound. For the work intervals, I encourage you to exercise at an intensity between comfortable-but-challenging and comfortable-but-more-challenging. These distinctions are entirely subjective; your senses will help you accurately and effectively gauge the intensity. You will use perceived exertion to self-monitor your workout intensity, and quite precisely. In fact, exercise enthusiasts, fitness professionals, and scientists have been using the perceived-exertion method to self-monitor exercise intensity for the last fifty years. For your recovery intervals, choose an exertion level that feels like a light-to-moderate intensity. (We’ll discuss the details of the perceived exertion approach more thoroughly in Section 3, prior to starting the HIIT workouts.)

Another rather simple way to monitor your workout intensity is with the talk test. Using the talk test as your guide, a comfortable-but-challenging workout would be one where you are able to carry on a conversation, but have some difficulty speaking. I know it may seem a little bizarre, but there are studies that show the talk test is a very reliable measure of exercise intensity. Using the talk test as a guide, during the recovery intervals you should be able to carry on a conversation with mild to no difficulty.

When it comes to designing HIIT workouts, particularly those created by sports performance coaches, a major consideration is the time ratio between the work and recovery intervals. This time ratio describes the length of the work interval and the length of recovery interval. Essentially, this ratio can be deliberately designed to improve a specific sport performance variable. For instance, with track sprinters, coaches use short powerful work intervals to improve the speed a...

Table of contents

• 1. Exercise: The Quality of Life Super Pill
• 2. What Is High-Intensity Interval Training (HIIT)?
• 3. What Are the Health Benefits of HIIT?
• 4. How Does Your Body Power Your HIIT Workouts?
• 5. Ten Steps to Succeed in an Exercise Program
• 6. Do It Right: Avoid These Exercise Mistakes
• 7. Time for Your Heart Health Pre-Check
• 8. Let’s Get Up and Start Moving Now!
• 9. Successful Weight Management; “Inch by Inch, It’s a Cinch”
• 10. Lessons from The Biggest Loser
• 11. Secrets from Real-Life Biggest Losers
• 12. What’s the Healthiest Diet for Me?
• 13. Low-Carbohydrate versus Low-Fat Diets: What Is the Verdict?
• 14. The Stress-Cortisol-Obesity Connection
• 15. 50 Frequently Asked Health, Nutrition, and Weight Management Questions
• 16 Pre-Exercise Fundamentals
• 17. Why Your Workout Warm-Up and Cooldown Are So Important
• 18. How Hard Should I Exercise?
• 19. Your HIIT Workouts Plan
• 20. Your HIIT Workouts—Enjoy!
• 21. The Future of HIIT Workouts—25 MORE Workouts!
• My Salutation to You
• References
• Acknowledgments
• About the Author