We put this on the list because of how easy it is to manipulate the degree of difficulty. If a regular plank is too easy for you, lift an arm, or a leg—or an arm and a leg. Put your feet into a TRX and give that a whirl. Still too easy? Take your feet out, and put your forearms in. Each one of these progressions leads to a greater training stimulus to the abs.
Thankfully, if you’re already reasonably fit, just a few tweaks to your routine here, a few modifications to your diet there, and you’ll be well on your way to shredded stomach glory. To that end, we’ve gathered up the best tips and tricks—expert-approved advice to ensure that, in no time, you’ll have the sculpted abs of your dreams. And for some core-specific moves, check out The Best Workouts For Getting That Summer Six-Pack.
Abdominal muscles consist of three layers. The very deepest layer is the transversus abdominis, which acts as the body's girdle, providing support and stability and plays a critical role in exhalation. Next is the rectus abdominis, which flexes the spine. Closest to the surface are the internal and external obliques, which turn the trunk and provide the body with rotation and lateral movement.

Lie on your back, arms behind your head, like you’re in a crunch position, with legs raised and bent at a 90-degree angle. Kick your legs back and forth like you’re riding a bike. While you do that, alternatively twist the upper part of your torso in tandem with your legs. For maximum toning, do this for as long as you can take it. Once you master this move, you’ll never forget it—it’s just like riding a bike!
“I alternate between all-out effort sprints (30 to 60 seconds) and walk/jog as a recovery until I feel fatigued. Intensity is key. Abs work as stabilizing muscles during a sprint, so the harder I push myself the harder my abs will work! Plus, there’s no equipment required, and I get a high calorie burn and full-body workout done in very little time. (I tell myself I can do anything for 30 seconds.) Depending on how I feel, I’ll either add this to the end of a routine or make it my entire workout, two to three times a week.” —Suzanne Cover, @suzannecover
If you want to get fit faster and burn more calories in less time, don't spend all your time in the so-called fat-burning zone. Instead, add some High Intensity Training (HIT) to your workouts a couple times each week. According to the American College of Sports Medicine, you can burn more calories in less time with short, high intensity exercise. You can also boost your overall cardiovascular fitness with this type of training. Be sure to slowly ramp up your intensity, however, or you could wind up with an injury.​
Start lying faceup on the mat. Lift head, shoulder blades, and feet off floor as you extend arms straight out. Neck should be relaxed, not strained. This is your hollow hold. Next, engage abs to lift chest towards legs as you bend knees so that body forms a V shape and shins are parallel to floor. Slowly lower back down to a hollow hold position and repeat.
“I alternate between all-out effort sprints (30 to 60 seconds) and walk/jog as a recovery until I feel fatigued. Intensity is key. Abs work as stabilizing muscles during a sprint, so the harder I push myself the harder my abs will work! Plus, there’s no equipment required, and I get a high calorie burn and full-body workout done in very little time. (I tell myself I can do anything for 30 seconds.) Depending on how I feel, I’ll either add this to the end of a routine or make it my entire workout, two to three times a week.” —Suzanne Cover, @suzannecover
After having achieved this goal, there’s a seemingly big void in my life. I intend to fill it up with another ambitious goal instead of more training, though the latter is far more tempting! I find that training, staying fit, and eating right fits in very well with my lifestyle. I intend to keep it that way while being content with slow but lean and steady gains over time. I do intend on dabbling in boxing and advanced callisthenics in the future.
But instead of just trying to perform as many reps as possible, slow down and really focus on the quality of the movement—especially the eccentric, or downward motion, of the exercise, he says. “The eccentric contraction is the most important phase when sculpting any muscle.” Plus, focusing on quality over quantity will help protect your back (some experts say crunches can be potentially troublesome for guys with back issues.)
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