How it Rides: Technically Total Gym uses body weight as resistance against the consistent pull of gravity. You adjust your body on the glideboard, which rolls up or down on an incline plane, allowing you to become the weight. You literally "pull or push your own weight" up the incline. There are various levels of calibrated resistance*, each representing a constant percentage of the users body weight. This percentage translates into pounds used as resistance. You simply raise or lower the incline of the Total Gym to increase or decrease resistance. A chart is provided with Total Gym to determine how much resistance you are using, depending on body weight, level of incline, and whether you are performing the exercise with or without the pulley system. Total Gym’s dynamic pulley system allows you to perform exercises through all three natural planes of movement with unrestricted range of motion. You can perform exercises in any plane of motion, front to back, side to side or rotating, from a sitting, kneeling or lying position. The pulley system allows unrestricted range of motion when performing each exercise. Total Gym doesn’t lock you into a body position or limit your range of motion in an exercise. * The number of resistance levels varies among models.