For this HIIT 100s program, I've combined HIIT not only with weights but also with two very popular, intense, and effective weight-training techniques: German volume training (GVT) and Hundreds training. With GVT, aka 10x10, you do 10 sets of 10 reps on a given exercise. Hundreds, as the name implies, involves doing 100-rep sets. With Hundreds, you'll do 10 sets of 10 reps for one exercise per muscle group. Sounds the same as GVT, right? Not exactly.
For example, when it comes to hormones, ghrelin makes you hungry, leptin and other hormones keep you feeling full, Nadolsky says. Thyroid, cortisol, insulin, testosterone, and estrogen all influence how you metabolize and store energy. Meanwhile, genetics have a large influence on both basal metabolic rate (how many calories you burn just to live) and hormone health. While all of these things are impacted by our diet, they’re not only controlled by the way we eat. And, in fact, while sleep, stress management, and, when needed, medication can help regulate other hormone levels such as estrogen and thyroid, our hormones and other physiological processes are often out of our control. And by the way, being able to impact our hormone levels and metabolism with our diet doesn’t always work out in favor of weight loss. As a 2016 review notes, one of the reasons weight loss by way of caloric restriction isn’t efficacious is because “this strategy is countered by the body’s natural physiological response to negative energy balance.” In other words: The body fights back against caloric restriction.
The major reason HIIT works so well for dropping body fat is due to the greater calorie burn (or EPOC—excess post-exercise oxygen consumption) that's maintained after the workout is over. In other words, you burn more calories and more body fat while you're sitting around doing nothing. In addition to this increase in resting metabolism, HIIT is effective at enhancing the mechanisms in muscle cells that promote fat burning and blunt fat storage.
You must have noticed that some of your friends eat a lot of sugar-based foods, fried foods, or cold drinks. Yet, they manage to have a flat stomach, the reason being they have a very high metabolic rate. If your metabolism is not good, you may have a bloated stomach. Thyroid conditions, diabetes, and other medical conditions can be the reasons for slow metabolism.
Do you even lift, bro? If you’re serious about getting rid of that belly fat fast, resistance training might just be the key. A study from the Harvard School of Public Health found that adding weight training to adult male test subjects’ workouts significantly reduced their risk of abdominal obesity over a multi-year study period, although doing the same amount of cardio had no such effect. Research from the University of Maryland even found that just 16 weeks of weight training boosted study participants’ metabolic rates by a whopping 7.7 percent, making it easier to ditch those extra inches around your middle.
You can blame biology for your sweet tooth. We’re hardwired to have a preference for sweets, and this drive is universal and begins early on, according to research on the subject. Sugar makes food taste good, so food companies add it to everything from breads to soups to salad dressings to cereals, yogurts and more. This adds up to way too much sugar!

If we had a dollar for every well-intentioned person who's centered his or her fat-burning efforts around low- to moderate-intensity cardio sessions, we could make Fort Knox our summer retreat. This "I'm trying to lose weight, so I'm just doing cardio" attitude has become epidemic, as people waste countless hours on ellipticals, treadmills, and stationary bikes, with very little to show for it. The results they're after, of course, are washboard abs and an overall leaner physique, which is best accomplished through high-intensity lifting at appreciable volumes.
For weight training, you have two options. 1) 3 days of full-body weight training workouts like these, or 2) 4–5 days a week of body part split workouts like this leg workout. If you prefer to train at home, get a set of resistance bands and learn how to use them, along with a yoga mat, and maybe also a pull-up bar and pair of adjustable weight dumbbells.
Not much of a coffee drinker? Tea is also a natural diuretic, and types of herbal tea such as dandelion or fennel root can also lend a hand. In fact: When a recent study compared the metabolic effect of green tea (in extract) with that of a placebo, researchers found that the green-tea drinkers burned about 70 additional calories in a 24-hour period.
Not a jock? Find other ways to fit activity into your day: walk to school, jog up and down the stairs a couple of times before your morning shower, turn off the tube and help your parents in the garden, or take a stroll past your crush's house — anything that gets you moving. Your goal should be to work up to 60 minutes of exercise every day. But everyone has to begin somewhere. It's fine to start out by simply taking a few turns around the block after school and building up your levels of fitness gradually.
Want to instantly burn more blubber in your workout? Research conducted at Brunel University found listening to your favourite tracks will increase your endurance by a massive 15 per cent. And if you really want to turn your weight loss up to 11, Social Psychological and Personality Science found that heavy bass increases your sense of personal power to help you get the most out of the gym.
Switch to Lighter Alternatives. Whenever you can, use the low-fat versions of salad dressings, mayonnaise, dairy products, and other products. "You can trim calories effortlessly if you use low-fat and lighter products, and if the product is mixed in with other ingredients, no one will ever notice," says Magee. More smart substitutions: Use salsa or hummus as a dip; spread sandwiches with mustard instead of mayo; eat plain roasted sweet potatoes instead of loaded white potatoes; use skim milk instead of cream in your coffee; hold the cheese on sandwiches; and use a little vinaigrette on your salad instead of piling on the creamy dressing.
Good point: Even if a weight or body fat percentage is achievable, at a certain point, the investment required to make it happen or sustain it just isn’t worth it, Moore says. And as Albers explains, the ultimate goals are to have energy, be healthy, be able to lead the life you want, and feel that your healthy habits add to, rather than take away from, the quality of your life.
Worried about hunger? There are a lot of simple tactics you can use to curb your appetite. Drink caffeine in the morning to kill your appetite until lunch, eat a lot of vegetables and protein, drink a lot of water, and make sure to have your sugar water at night. The first few days can be tough, but the hunger goes away a lot faster than you’d think.
Dairy products such as cream and cheeses. They work well in cooking as they satisfy. The problem is if you’re munching a lot of cheese in front of the TV in the evening… without being hungry. Be careful with that. Or lots of cream with dessert, when you’re actually already full and just keep eating because it tastes good. Or another common culprit: loads of heavy cream in the coffee, many times per day.
Lauren is concerned with what she puts in her body, and you should be too. That’s why we’ll tell you the ingredient in this supplement that might make it so effective. K Shred contains BHB. BHB is an exogenous ketone. Remember that ketones are what you want your body producing when you’re on keto, so this is just a boost to that endgame. BHB stands for Bet-hydroxybutyrate in case you’re curious or feel like looking it up to learn a little more.
Rather than a long and low-intensity cardio workout, try the HIIT method of cardio: intense, fast-paced intervals that leave you completely exhausted after only a 20- to 30-minute session. This form of cardio training increases the afterburn effect, allowing your body to continue burning calories long after your workout is over. You can rotate between 30 seconds of your favorite exercises, with rest in between, as long as they work different muscle groups—such as squats, push-ups and kettlebell swings.
Control Your Environments. Another simple strategy to help cut calories is to control your environment -- everything from stocking your kitchen with lots of healthy options to choosing the right restaurants. That means avoiding the temptation by staying away from all-you-can-eat restaurants. And when it comes to parties, "eat a healthy snack before so you won't be starving, and be selective when you fill your plate at the buffet," suggests Ward. Before going back for more food, wait at least 15 minutes and have a big glass of water.
"Protein is great for fat loss. It helps build and preserve lean muscle tissue and can increase the amount of calories you burn. It’s also a great source of energy that helps you feel fuller for longer, so you’re less tempted to snack. Good sources include chicken breast, tuna, eggs, milk and chickpeas. And if you’re finding it difficult to avoid snacks that are high in carbohydrates, try substituting them for protein shakes or bars. Remember also to opt for the lean sources of protein because some sources can be high in saturated fat."
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