Progress has been made in exercise science, giving us a better idea of what causes post-exercise muscle soreness. It’s not an accumulation of lactic acid (as the Ottawa Senators once believed), and it is not a continuous muscle spasm. Exercise physiology has discovered that muscle soreness is caused by the micro tears of muscles during physical activity. The question is, why does the pain feel its worst 24 to 48 hours AFTER you stop exercising?
Owner of Bieman Fitness and Personal Trainer