Final answer:
The hip adductors are most active during the Mid Stance phase of gait where they stabilize the pelvis and adduct the femur to maintain balance. They also play a role during other phases, notably the Swing Phase, for controlling leg movement.
Step-by-step explanation:
The hip adductors are active during multiple phases of the gait cycle, providing stability and control of the pelvis and thigh. However, they are particularly active during the Mid Stance phase of gait, which is the correct answer to 'At what phase of gait are the hip adductors active?'. During this phase, the body's weight is transferred onto the leg, and the hip adductors work to stabilize the pelvis and adduct the femur to maintain balance.
It's important to note that the hip adductors can also be active in controlling the leg during the Swing Phase as the leg moves forward, but their role during Mid Stance is crucial for stabilizing and keeping the pelvis level.