Lie prone on floor with hands slightly wider than shoulder width. Raise body up off floor by extending your arms with body straight. At the end of the movement raise one arm sideway up and reach up. Turn your body sideway resting on your other arm.
Keeping body straight, lower body to floor by bending arms. Push body up until arms are extended. Repeat.
Both upper and lower body must be keep straight throughout movement. Exercise can be performed without additional weight or you could use dumbbells for lifts.