Lie on your back with your knees bent and your feet flat on the floor (A). Using both hands, pull up one knee and press it toward your chest (B). Tighten the muscles in your belly and press y… 展开

Lie on your back with your knees bent and your feet flat on the floor (A). Keep your shoulders firmly on the floor, and slowly roll your bent knees to one side (B). Hold for 5 to 10 seconds. S… 展开

Lie on your back with your knees bent and your feet flat on the floor (A). Tighten the muscles in your belly so that your lower back pulls up, away from the floor (B). Hold for five seconds … 展开

Lie on your back with your knees bent and your feet flat on the floor (A). Keep your shoulders and head relaxed on the floor and tighten the muscles in your belly and buttocks. Then r… 展开