Fitness Analyst Question:

Muscle soreness or discomfort that appears 12 to 48 hours after unaccustomed or strenuous exercise. The soreness is felt most strongly 24 to 72 hours after the exercise. It is most likely due to microscopic tears in the muscle tissue, and it usually takes a couple of days for the repair and rebuilding process to be complete. After the experience, the muscle adapts rapidly to prevent muscle damage, and thereby soreness, if the exercise is repeated.