The Weider X-Factor is the total-body training system that attaches to any door. The unique design promotes explosive movements for a total-body workout. You'll build bigger, more powerful muscles, fast. It's engineered to fit in any standard door with progressive resistance exceeding 210 lbs. And, to help you maximize your workout time, follow the step-by-step exercise chart and workout DVDs. The X-Factor is made with durable tubing and comes fully assembled.