Cobra Pose
http://www.youtube.com/watch?v=giWLeXbBBtY
Lie on your belly,forehead to the floor,bend your elbows and place
your hands beneath your shoulders for support,tighten your thigh
muscles and lift your torso,without straining your neck. Hold for 5
to 10 seconds,repeat 10 to 15 times.
Cobra pose will strengthen the back,hips and the legs.