Provided is a jerk block having a platform sized and constructed to hold a plurality of weight plates, a rig connector for removably mounting the platform to a rig support having plurality of holes, and a lock constructed to removably lock or clamp the jerk block in place using at least one of the holes on the rig support. Also provided is a jerk block assembly having two jerk blocks mounted on two rig supports, and a method of using the jerk block assembly to workout lifting weights in which the barbell is only supported on the rig by the weight plates contacting the platforms.