Dwayne is walking downhill for a long distance and feels muscle soreness in his quadriceps because he is not used to performing this type of exercise. What is the MOST accurate way to classify this downhill walking exercise?
A. He is performing a concentric contraction.
B. He is performing an isometric contraction.
C. He is performing an eccentric contraction.
D. He is performing an involuntary contraction.
