Instruction: Lie on your back with your legs bent and raised. Bring your knees toward your chest. Slowly lower legs to starting position.

Instruction: Raise legs by flexing hips and knees until thighs are just past perpendicular to torso. Return until hips and knees are extended. Repeat.

Instruction: Lie on your back with your legs bent. Place your palms at the back of your head. Raise the upper part of your body a few inches forward and upwards with the help of your abdominal muscles. Return back to starting position. Repeat.