The Nautilus Omni machines were used primarily during the Colorado Experiment and provided training advantages that no other piece of equipment ever provided – a foot pedal that allowed the trainee to perform the exercise in a negative only or negative accentuated manner in the most efficient way possible. These were the only machines, before or since, that allowed all five distinct methods of training to be performed. Above, Casey Viator does a set on the Omni-Bicep machine.