COMMERCIAL LOWER BODY CROSS TRAINERA Commercial High End cross trainer designed to concentrate on the lower body. The 750A Arc Trainer has all of the features of the Total Body Arc Trainer without the Arm motion. Popular with coaches & trainers, the Lower Body Arc is often chosen because it gives added workout flexibility.CROSS TRAINERS VS ELLIPTICALSNot all cross trainers are created equal. Cross training refers to working various parts of the body by combining different exercises in a variety of ways. Typically one activity or sport trains certain partsof the body but not others. Cross training aims to eliminate this. Cross trainers are generally non-impact machines – sometimes called "ellipticals” – which refers to a specific motion. All ellipticals are cross trainers but not all cross trainers are ellipticals.