Pelvis
Pelvis — the pelvic ring
Short definition
Bony ring (sacrum, ilia, pubes) — the spine's base and the leg's anchor.
Full definition
Pelvis — a bony ring of the sacrum, ilia, pubes and ischia, supporting the spine from below and joining the femurs (hip joints). It anchors the erectors, glutes, adductors, deep hip flexors, core (thoracolumbar fascia) and gastrocnemius (via fascia). Pelvis stability underlies posture and the transfer of force from the legs into the trunk.
Examples
Holding the hip angle in a squat — glutes and core work.