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. 

1. Consume fewer calories than you're burning every day. Job one when trying to achieve a six-pack is to lose weight, which means expending more calories than you take in on a daily basis, says Dani Singer, a certified fitness nutrition specialist and certified personal trainer in Baltimore. He's the director of Fit2Go Personal Training. To optimize losing fat and not muscle, you need to be in a caloric deficit, eat adequate protein and strength train, he says. "The source of your food will affect health, but will have zero effect on your body composition," Singer says. "It's the total calories and macronutrients [protein, fat and carbs] from your foods that will determine how your body looks."
"One of the main jobs of the abdominal or core muscles is to act as stabilizers for the trunk, helping to support while the person is squatting, lifting, or moving about in general. Many studies show that muscle fiber activation rates in the rectus abdominis, transverse abdominis, and internal and external obliques are higher during the squat than during many ‘traditional’ crunch type exercises where the performer is lying on their back."

The Ab Roller is number 9 for targeting the rectus abdominis, and you've probably seen this around the gym (or under your bed) for the last several years. What's nice about this that it provides neck and arm support, something that might be helpful for people who feel strain in the neck when doing regular crunches. If you don't have an Ab Roller, you can still get a great workout with a variety of core exercises.
During your weight-training workouts try to keep your rest periods to a minimum between each set. Rest periods between sets should be 30 to 60 seconds in length. With shorter rest periods between sets your heart rate will stay elevated throughout the entire workout. Again, this is just another simple strategy you can use to increase caloric expenditure and enhance fat loss!

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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