Post-workout pains, also known as delayed onset muscle soreness (DOMS), are a common experience for athletes and fitness enthusiasts. ACHES are one of the most common symptoms of DOMS, which can occur anywhere from 24 to 72 hours after exercise. Other symptoms include stiffness, tenderness, and fatigue. DOMS is caused by microscopic tears in the muscle fibers, which can be prevented by proper warm-up and cool-down exercises.