During the lowering phase of a "dead lift" exercise the agonist muscles of the knee include all of the following except:

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During the lowering phase of a deadlift, the agonist muscles of the knee are primarily responsible for extending the knee to control the descent of the weight. The rectus femoris, vastus intermedius, and vastus medialis are all part of the quadriceps group, which are the main knee extensors. The semimembranosus, however, is part of the hamstrings group, which acts as a knee flexor, not an extensor, making it the incorrect choice as an agonist muscle in the context of knee extension during the lowering phase of a deadlift.

During the Lowering Phase of a "Dead Lift" Exercise the Agonist