A towel can be used for isometric exercises. “ISO” literally means “equal” while “metric” is a measurement. Such routines involve keeping a static position with a contraction of a muscle or muscle group, but the muscles remain at a fixed length. Simply put, the amount of force you use to pull a towel may change, but the angle of your joints does not vary. Isometric exercises are beneficial because they are more gentle on the joints in comparison to weight-bearing exercises, like weightlifting. They are often incorporated into rehabilitation exercise routines, which can help people recovering from procedures like hip surgery, to improve strength without adding too much stress on the affected joint.