Final answer:
During the late swing phase of ambulation, the hamstrings exhibit peak activity.
Step-by-step explanation:
During the late swing phase of ambulation, the hamstrings exhibit peak activity. The hamstrings are a group of muscles located in the posterior compartment of the thigh. They include the biceps femoris, semitendinosus, and semimembranosus, which all play a role in flexing the knee.