Why You Shouldn't Worry About Butt Wink (Slight Lumbar Flexion During Squat)

Summary by Krater

This video examines "butt wink" or lower back rounding in the bottom of a squat, concluding that minor lumbar flexion is natural and inevitable for most people due to hip joint morphology rather than mobility or hamstring tightness.

From the video

Answers: Why does my lower back round at the bottom of a squat?

• butt wink in squat
• lumbar flexion during squat
• pelvic tilt
• hip biomechanics
• squat depth

Exercises

• snatch · barbell
• back squat · barbell
• overhead squat · barbell

What it concludes

• Kyphosis of the lumbar spine in deep squatting is a natural part of the squat movement when using loads equal to 50% of body weight.
• Coaches should not prevent experienced squatters from experiencing lumbar flexion to the small extent shown in research.
• Slightly increased stance width can help reduce lower back rounding.
• The primary cause of lower back rounding in deep squats is hip joint morphology rather than mobility issues or hamstring tightness.