is there any way to add resistance to rollers? like with stationary bikes, they have a felt or likewise material pad that presses up against the spinning steel disc in order to give it more friction. i don't have them yet but i've tried a friends, and thought of a way to provide a bit more resistance. i was thinking of taking a very small piece of carpet, like 2x6-8 inches, wrapping it around one of the rollers with a nylon belt, and attaching the other end to my bed frame. then, move the rollers away (the entire unit, obviously) until the belt is taught, and providing friction.

does this make sense? think of it like a belt drive wheel on an engine, but the belt it is supposed to spin does not spin with the wheel.