Equipfit Power bands are versatile, light, easily transportable and cater to a range of training purposes. Body Weight Assistance (Assited Pull Ups) /Resistance Training (Resistant Press Ups) Explosive Plyometrics Powerlifting Strength Training Speed and agility training Jumping Aerobics Stretching, Flexibility and Mobility exercises General conditioning Rehabilitation Each band is 41" long. Below are some general guidelines for band usage. Large #4 (Green) 45mm Can be used by stronger benchers, and with exercises involving the lower body, calves, quads, hamstring and glutes. These bands are also good options for mobility and stretching.