Portable, convertible and multifunction exercise apparatus, devices, systems and methods of using that allows individuals to accomplish their fitness, health conditioning, weight loss and rehabilitation goals with a single platform having selectively length adjustable resistance bands. Rotatable spring biased wheels can lock the bands to different lengths, where the longer the length the less resistance, and the shorter the length the more the resistance. The platform can transform from a stepper into a bench to an incline seat with foldable legs. Contained within the platform storage unit are several bars handles and leg attachments. An exercise bar having a rotatable midportion can have handle grip ends removably attachable to the bands and/or the bar so that a variety of additional exercises can be performed allowing the user to exercise all muscle groups for a total body workout.