The X3 Home Gym is a variable resistance strength training system that builds more muscle in less time than traditional weight training. Developed by Dr. John Jaquish, X3 uses resistance bands and a precision-machined bar to increase load where muscles are strongest — driving complete fatigue and faster growth in 10–20 minute workouts, without the joint stress of conventional weights. The X3 Home Gym is available in two configurations. The X3 Elite Home Gym ($549) includes the X3 Elite Bar, four heavy-duty resistance bands (10–300+ lbs), a steel ground plate, the X3 12-Week and Hypertrophy workout programs, and the free X3 Workout Tracker app. The X3 Force Smart Gym ($949) adds a built-in force sensor, real-time force tracking, rep-by-rep coaching, and a free X3 Squat Belt — all managed through the X3 Force app (Force Premium subscription required for full features; one-month free trial included). X3 Force ships within the USA only. Both systems are backed by a 90-day money-back guarantee covering opened, used products.