Sets: 2 Reps: 10-20 Rest: 60 seconds

Lie on the floor on your back and squeeze a light medicine ball or basketball between your ankles. Lift your feet, keeping your legs straight.

Sets: 2 Reps: 10-20 Rest: 60 Seconds

Slowly lower your legs as far as possible, keeping them straight, without touching the floor. In the same motion, return your legs to the starting position as fast as possible. That’s one rep.

Sets: 2 Reps: 10-20 Rest: 60 seconds

Lie on the floor on your back, with your knees bent 90° and your feet flat. Keep your arms straight and parallel to the floor.

Sets 2: Reps: 10-20 Rest: 60 seconds

Quickly sit up by contracting your abs and raising your torso until you are almost sitting upright. Return to the starting position and repeat.

Sets: 2 Reps: 10-20 Rest: 60 seconds

Lie on the floor on your back, with your legs straight and about an inch off the floor. Hold your arms at your sides, slightly elevated and parallel to the floor.

Sets: 2 Reps:10-20 Rest: 20 seconds

In one movement, quickly lift your torso into an upright position as you pull your knees to your chest. Lower your body back to the starting position and repeat.