Final answer:
Delayed-onset muscle soreness (DOMS) occurs 24 to 72 hours after strenuous exercise and is believed to be caused by tiny tears in muscle fibers.
Step-by-step explanation:
Delayed-onset muscle soreness (DOMS) occurs 24 to 72 hours after strenuous exercise. DOMS is a condition where pain or discomfort in muscles is felt one to three days after exercising. It is believed to be caused by tiny tears in muscle fibers that occur when muscles are used at a high intensity.