This excellent exercise band provides steady, controlled resistance that demands correct form. Working with an exercise band allows the ability to exert the right resistance in the correct target area. After several years of hard use, the band (blue = heavy weight) continues to work perfectly. I also recommend the purple (highest weight). These Xertube resistance bands are a vital supplement to free-weights, providing smooth, targeted isolation of muscles, highly recommended for adding effective versatility to your workouts.