Cycling....

Lie on the back comfortably. Raise hands and legs above the ground. Stretch right leg and right hand
 and simultaneously draw back the left hand and left leg. Then stretch the left leg and left hand. Draw
back the right leg and hand. Do this exercise 10 to 15 times. After finishing relax for a minute.
Do this exercise in normal breath.
Benefits
Strengthens abdominal muscles.