Explore the relationship of the piriformis and pelvis.

With the leg fixed as in the gait cycle the piriformis is a hip abductor (contra-lateral lateral flexion) and rotator of the pelvis via the sacrum.

This relationship can be explored in open chain by adding a bolster to create side bending as a postural set up for the classic clamshell exercise.

Also check out the SL RDL exercise variation- “T Hip Mobility” video to see how I use this relationship as an important cue.