What is a butt wink?
Rounding of the lower back at the bottom of a squat
You can eliminate butt wink by
1. Bracing your core
2. Activating your glutes
3. Don’t squat so low that it forces a posterior pelvic tilt until mobility is there
Why Should you worry about getting rid of a butt wink on squats?
Avoid injury! Especially herniated discs