I like to take my resistance band and, holding it taught behind me, straighten my arms and then bend them to 90 degrees about 25 times. You should hold your arms above and slightly behind your head, elbows bet at 90 degrees, fists furthest up toward the sky. It works out your arms, and it also develops and warms up your upper and lower back muscles. Great for arabesques and finding the muscles you should be using to correctly hold your arms.
