This Arm Pulley is very easy to use, making physical therapy and exercising simple. One can use this pulley anywhere, at home or at the office. Great for recovery after surgery and injuries, these pulleys are also beneficial for improving your strength, mobility and flexibility. It helps increase range of motion I your shoulders after surgery. Ideal for people with tendonitis, arthritis, frozen shoulder syndrome, capsulitis, rotator cuff injury, or bursitis, this pulley gets easily attached to most doors in under a minute.