Strengthen and tone your arms, chest, shoulders, and back with this Resistance Cord Kit. The Xertube helps target muscle groups through a full range of motion while the included door attachment turns your home into a gym! The versatile attachment increases your exercise options with the Light Xertube, allowing for upper arm and shoulder strengthening work. The door attachment is made from lightweight, heavy-duty woven nylon. Ideal for any fitness level. Available in Light resistance.