Sebastian Oreb | Online Coach & Mentor for Personal Trainers on Instagram: "Fix your buttwink with this cue! Buttwinking is where the pelvis rotates posteriorly in the bottom of a squat which is a weaker position and can (not always) cause pain or discomfort in the lower back or hips. One of the reasons this happens is that people arch their backs (extend their spine) too much, and the reason they are doing this is to try and stop the spine from rounding forward (spinal flexion). As a result of