Smith machine

The Smith machine is a cross between a machine and a free weight barbell. It is a barbell that slides on a fixed rail, and can lock into certain places on the track. there is a simple J hook locking mechanism that acts as a spotter. The Smith machine is good for exercises in which the barbell moves only along the vertical plane. For instance, this would be a horrible choice for practicing snatches, but a good choice for bench presses.