Hold yourself at arms' length above the parallel dip bars. Cross your legs up behind you. Keeping your head up and your body as upright as possible, slowly lower yourself until your arms are bent to a 90 degree angle. By keeping your body upright, you put greater stress on the triceps. If you let your upper body lean forward, the stress will shift to the pectorals. At the bottom of the movement, press yourself back upward until your elbows almost lock. Hold this position for 2 seconds. If you are able to do more than 15 reps you should consider adding resistance by adding a weight belt around your waist.