Abs Exercise 30: Bent-knee crunch (rectus abdominus)

Men's Fitness Workouts - Getting High-Impact Abs

Lie on your back on the floor with your knees bent and your heels resting on an exercise bench. Place your hands by your ears. Roll your chest and shoulders toward your knees until your shoulders and upper torso are off the floor. Pause for a second to contract the abs, slowly return to the starting position and repeat. Perform 1-3 sets, 15-30 reps.