Weight machine

This allows the same machine to provide several levels of resistance over the same range of motion with an adjustment that requires very little force to accomplish in itself.

On other machines the bar is attached to a cable or belt, which runs through pulleys or over a wheel.

The other end of the cable will either be a handle or strap that the user holds or wraps around some body part, or will be attached to a lever, adding further simple machines to the mechanical chain.

They combine a bar-end on which to hang the plates with several simple machines to convey the force to the user.

On the other end of the spectrum may be a bent-over-row machine that is designed with the user's grip between the plates and the fulcrum.