A weight apparatus includes a bar including a handle, an anchorage rotatably mounted to an end of the handle, the handle and the anchorage having an axially extending opening, a pinion gear rotatably mounted in the axially extending opening, a rod slidably disposed inside the axially extending opening and having a rack arranged to be moved axially relative to the axially extending opening upon rotation of the pinion gear, and a gear drive arrangement for rotating the pinion gear upon rotation of the handle relative to the anchorage.