Uses Isometrics, the fastest way to build strength & lean muscle. Transform your body in less than 10 minutes a day with with ISO 7X. It also includes and extensive Workout Wall Chart (Included) gives you 36 power-packed exercises for a total-body transformation. ISO 7X uses the power of Isometrics? a series of static contraction exercises where you push or pull on the ISO7X using 70% of your strength and hold for just 7 seconds per exercise. ISO7X builds strength, power and lean muscle without the need for multiple repetitions, and no strain on joints.