Lie on your back with your legs straight and fingers placed on your abdominal muscles between the pelvis and ribs.
Contract your abdominal muscles by pulling your navel toward your spine, but do not hold your breath.
Exhale to flatten your abdomen and feel the muscles under your fingers become firm.
Slide your heel on the surface to bend both the hip and knee.
Keep your pelvis still while moving your leg.
Return your leg to the starting position, relax, and then repeat with the other leg.
