From a dip position protract your scapula, so that your back is rounded. In addition tighten your lats so that your scapula is also depressed. Finally squeeze your core and tilt your pelvis, so that you don't arch your back. From this position do a dip trying not to lose the form. When you finish the rep lock your arms and adjust the position again.
biceps, dorsals, core
triceps, chest, biceps, dorsals