Have you used resistance tubing or bands yet? Why not? They are becoming very popular in a lot of individuals fitness routines. Exercise bands and tubing come in a variety of colors and lengths. Each color corresponds to a certain degree of tension, i.e. light, medium, heavy, extra heavy. Tension in resistance bands and tubing increases as they are stretched. It is important to note that not all manufacturers follow the same color guidelines, so don't be afraid to ask you local fitness...