Supine Groin
Welcome to the world of hip extension! Yes, the feeling you are having in the gluts and hip are the muscles of the pelvis, hip and back ALLOWING your hip joint to extend functionally. If you are too tight in the hip flexors (i.e. ilio-psoas), you will not feel the quad contraction move up as you did. A good idea is to compare the right & lefts and make sure they feel symmetrical.
Of course, hip extension is important in almost every sport but most people do not achieve true extension because of tight hip flexors. Sitting tends to do this, so weekend warriors and desk jockeys are susceptible to this limitation.
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