Muscle fibers will produce lactic acid after strength training, which is an intermediate product produced during glucose metabolism in the body. Aerobic exercise is needed to accelerate excretion. After strength training, you will run for a while, sweat, stretch and relax.

After training, muscles will be congested, because muscles need nutrients to recover, and the body will mobilize blood to bring necessary nutrients into muscles, so the water content of muscles will increase and the swelling will disappear after a few days.