Click, crack, pop! This post is a laugh but has many helpful links about body health and wellness for dancers.
Introducing the Iliopsoas
The iliopsoas is the only muscle (well, technically group of muscles) that attaches to the spine, pelvis, and femur (or, thigh). The three muscles which make up the iliopsoas are deep, running very near the spine and beneath other major muscle groups. Therefore, awareness of the iliopsoas must come through visualization.