I have no difficulty tilting my pelvis in a seated or standing position, or in a quarter squat when my body is upright. When my upper body is tilted forward 30 degrees, however, curling my tailbone forward for a posterior pelvic tilt leads to a familiar juddering that I recognize as the sign of a poorly coordinated muscle group. Does a different muscle take over in this position, or are the spinal erectors pulling the pelvis in an anterior tilt direction and not being very good at relaxing?

I don't think it's an issue with hip flexibility, my hip hinge is fine.

  • 1
    Do you feel the juddering in your glutes?? Commented Jan 21, 2015 at 13:13
  • That's a good question. No, it feels as though it's right around the tailbone -- as though there's a muscle pulling the tailbone down, and also tucking it to the front.
    – Noumenon
    Commented Jan 21, 2015 at 18:53

1 Answer 1


In broad terms the quadricep and hamstring/glueteus as well as the psoas and piriformis are responsible.

Yoga: Cat Camels, Pigeon Pose. Stretching: Deep Lunge, Toe Touches, Butterfly Stretch.


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