Participants use their own body weight as resistance and decide what level is right for them by "self-spotting". Self-spotting means the legs can be used to assist the user to perform exercises and/or when they cannot continue an exercise. A simple modification (usually leg placement) can allow for the set to be extended.
With the ability to easily add more repetitions (without having to stop and change a pin in a machine or have someone helping) this product becomes very versatile. This simple versatility allows the user full control over the amount of body-weight used for a given exercise. The result is greater muscle endurance and strength.