Exercise bands are versatile, portable and most of all – adjustable. You can easily change your training tension from rep to rep just by changing your body position or the length of the band. No need to swap weights or load plates. They are also fairly inexpensive to purchase and can easily be packed up and taken anywhere. Most of the time they come in 3 different weight ranges – light/medium for shoulders and arms, medium/heavy for back and chest, and heavy for lower body. .