An exercise apparatus having homolateral and contralateral modes of operation is disclosed. The exercise apparatus may include a frame supporting generally vertically oriented reciprocating members spaced apart and in substantial parallel relationship to one another. The reciprocating members may include foot supports fixedly secured at the lower distal ends thereof and handlebars rotatably mounted proximate the upper distal ends of the reciprocating members. The handlebars may be selectively locked for homolateral and contralateral operation of the exercise apparatus.