Now you can have it both ways. The Star Trac P-TBTx Total Body Trainer is the first machine to integrate strength training into a cardio workout. The product of Star Trac's partnership with BMW Group DesignworksUSA, the P-TBTx Total Body Trainer features our SelectFit® technology. At the push of a button the user can choose from a pushing or pulling upper body motion, working two distinctly different muscle groups. The upper body motion can even be disengaged for a focused lower body workout. Talk about pulling double duty.