Rowing:

Sit on the ground with legs stretched out in front. Join both the legs
Stretch your hands up without bending above the head.
Now bend forwards so that your hands go near both the feet and then pull your hands back simultaneously taking your body backwards(go back as much as possible) and then come straight with the hands stretched above the head.
This will be like as if you are rowing a boat.
Repeat it in anticlockwise direction.
Practice it for 5 times initially.