The deep six hip muscles from top to bottom:

• piriformis
• gemellus superior
• obturatur internus
• gemellus inferior
• obturatur externus
• quadratus femoris

Fact:

They are so deep and perplexing that even researchers aren’t quite sure what they do in every plane.

These deep muscles of the hip are either infrequently injured or misdiagnosed as hamstring or gluteal strains.