Your question was: What length of band or tubing should I use?
Our experts said: The most important consideration is to be sure your band is not too short. If your band is too short, you increase the risk of snapping. A general rule of thumb is to use a length of band or tubing equal to the length of the limb you are exercising. The pre-cut lengths of Thera-Band resistance bands are 5 feet long (1.3 m), which is typically long enough for most exercises.