A resistance system for fitness equipment includes a frame, a resistance source such as an elastic cord, coil or any other type of spring, weight, pneumatic or hydraulic cylinders. The resistance source is mounted to a resistance block with a load support. A support disk is provided that is movably mounted to the frame and adapted to enable selective engagement with the load support. A transmission member, including a pliable member such as a cable, belt or other member, is coupled to the resistance source. Movement of the support disk enables selective engagement of the resistance source. In this way one or more individual resistance sources can be selectively engaged or disengaged to vary the resistance to the user by actuation of a dial or other actuator as directed by the user.