Thera-Band 22.5 m. Exercise and Pilates Band The amount of resistance created by the bands was determined by the force created by doubling the resting length of the band. For example, when a 50 cm long red band is stretched to 100 cm, it reaches 100% tension, in which case the resistance is at the level of 1.8 kg. Which band color/resistance is right for you is determined by your physical condition. Choose a band that allows you to do 15 repetitions. Skin-colored and yellow bands are generally used for rehabilitation purposes (post-operative use). Red and green bands are generally used in protective exercise programs for women. Men generally use green and blue bands and should transition to black bands as they progress. Silver and gold bands are used in competitive sports.