Which muscle groups are most involved in hip extension during sprint propulsion?

• A. Rectus Femoris and Vastus Lateralis.
• B. Adductors Magnus and Longus.
• C. Hip Flexors and Abdominals.
• D. Gluteus Maximus and the Hamstrings (Biceps Femoris Long Head, Semitendinosus, Semimembranosus), with contributing posterior chain involvement.

Answer: (D)

In sprint propulsion, the leg drives the body forward by extending the hip. The main muscles doing this are the gluteus maximus and the hamstrings, which make up the primary hip extensor group and work together as part of the posterior chain to generate powerful hip extension and stabilize the pelvis for efficient force transfer. The rectus femoris and vastus lateralis are primarily knee extensors (with the rectus femoris also crossing the hip as a flexor), so they aren’t the main drivers of hip extension during push-off. Hip flexors and abdominal muscles focus more on lifting, flexing, or stabilizing the trunk and pelvis rather than producing the forward-driving hip extension. Adductors can contribute modestly to hip extension, but they do not match the gluteus maximus and hamstrings in propulsive power.