Below are a couple of videos (from my SoMA Essentials and SoMA Program courses) that briefly address re-balancing your pelvis - from both the supine/Arch&Flatten perspective, and the prone/Back Lift perspective.

Note that both Bridge & Boat and Diagonal Arch & Curl speak to similar Tilt/Twist (or ‘trauma reflex’) patterns. Yet, in my experience, doing this specific pelvis rebalancing in Arch & Flatten is often especially effective at smoothing and evening out (Tilt/Twist Reflex patterns as they show up in) Arch & Curl and elsewhere.

This approach is taught as ‘recalibrating the pelvis’ by Martha Peterson, and is a pretty fundamental movement in Essential Somatics® and the ES Movement Teacher Training. You can check out a link to one of the videos Martha made about this, by clicking here.