The GoFit Ultimate ProGym is the go anywhere, train anytime home gym that comes complete with its own personal trainer on DVD. Whether you are building size and strength, or increasing muscle definition, the key to the ProGym is the ability to add or subtract resistance. You can obtain 7 levels of resistance by creating different combinations of the tube strengths. Regardless of your fitness level, the GoFit Ultimate ProGym will help you attain a healthier you!