Equipment
One pair of three to five feet long rubberbands that you can purchase at sporting good stores. You can make your own by buying rubberbands used for slingshots at a hardware store or market. You can also use surgical tubing, which you can buy at a drugstore. If you need to shorten the band for more tension, make sure to loop it loosely around your hand. Always check your rubberband for tears before using it. As you get stronger, you can use two rubberbands instead of one.

1. Sit on end of the rubberband. Hold the other end with your thumb facing your body.
2. Exhale as you press upward with the band.
3. Inhale as you lower the arm back to starting position. Stand with your legs shoulder-width apart and knees slightly bent while facing your partner. You will need only one rubber band between you and your partner.

Performance Tips

Make sure to sit firmly on top of the rubberband, otherwise it will snap out from under you when you press upward.
2. Avoid locking or jerking your elbows straight.
3. If you have a history of shoulder pain, avoid this exercise.

Repetitions
Do 10 to 15 repetitions. Do another one or two sets if you want to.  

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