The key to pull-ups? Progression and patience. #GainfulFitPro Justin (@jay_ware) demonstrates 4 moves that build strength in the primary muscles used during this exercise: your lats, biceps, deltoids, rhomboids, and core 💪 Remember to engage in a proper warm up to lubricate your arm, back and shoulder muscles before to get the most of your workout. You’ll be a pull-up pro in no time! Follow @jay_ware for more fitness tips and tricks!