A butt wink, or a posterior pelvic tilt, can happen at the bottom of a squat when the spine flexes briefly on the way down and extends on the way up. It's not problematic with bodyweight or light loads, but this dynamic change in spine position can be problematic under heavy loads. When lifting heavy loads like with a barbell squat, we want the spine to be rigid and bear the weight equally at each vertebrae. If the lower part of the spine moves dynamically at the bottom of the squat under heavy
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A butt wink, or a posterior pelvic tilt, can happen at the bottom of a squat when the spine flexes briefly on the way down and extends on the way up. It's not problematic with bodyweight or light loads, but this dynamic change in spine position can be problematic under heavy loads. When lifting heavy loads like with a barbell squat, we want the spine to be rigid and bear the weight equally at each vertebrae. If the lower part of the spine moves dynamically at the bottom of the squat under heavy
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