Flex band or elastic band is used to develop muscle strength, speed and flexibility. For better proprioception and stability. Rubber develops resistance in both contraction directions. Unlike other props, the bands do not use gravity, but the load? depends on the tension and strength of the band itself. They differ in color i.e. strength, shape, length, width. They are used alone? or as a supplement to other props and apparatus. They are used in injury prevention, rehabilitation, and recreation. Exercises with them are functional, demanding, use multiple joints. Movements are made through all three planes.