The Double Station Retractor is an excellent way to tone important shoulder and upper back muscle groups, which are vitally important for maintaining good posture and relieving back pain. Workouts are always better if you have someone pushing you to keep going, which is why this machine is built to be used by two people simultaneously. This also helps it to be more accessible in populated areas, since people won’t have to wait until it is unoccupied to use it. And since the two stations face in opposite directions, eliminating the awkwardness of another person watching you work out. The chains are designed to provide a sufficient amount of resistance when pulled down on, which works out the muscles without causing too much strain. The handles have ergonomic padding, making them easy and comfortable to grip. The Double Station Retractors are designed for ages thirteen and up, and is durable enough to withstand years of outdoor conditions and frequent usage without requiring maintenance.