RTS GLOBAL EDUCATION on Instagram: "Think you’re lengthening your lats by reaching further behind your head? More shoulder flexion might not be the most efficient option. @dr.markslavin explains why… and once you see it, you can’t unsee it. One subtle change makes all the difference. And this is exactly what we teach Personal Trainers at RTS: Exercise Design, backed by Mechanics. #rtsglobal #personaltraining #exercise #gym #training #lats"