AB Crunch

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Three times a week, every other day, do 3 sets each of these 6 moves. Each set lasts 2 minutes; aim for 12 reps per set. Rest briefly between sets.

What It Does: Firms abs and strengthens core

How to Do It: Lie on your back, knees bent and feet flat. Interlace your fingers behind your head; keep head relaxed. Press your lower back into the floor and tighten your abs. Raise your shoulder blades off the ground to a count of 4; release and roll down to a count of 6. Repeat without pausing for 2 minutes.