Which of the following is an example of co-activation?

Question

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Co-activation refers to the simultaneous activation of agonist and antagonist muscles around a joint to provide joint stability. During a back squat, the hamstrings (antagonist to the quadriceps) are co-activated along with the quadriceps (agonist) to stabilize the knee joint. Choices A, C, and D describe situations where primarily the agonist muscle group is activated for the movement, not co-activation.

Which of the Following Is an Example of Co-Activation