Lactic acid is produced primarily in muscle cells and red blood cells when it breaks down carbohydrates under conditions of low oxygen levels. That is, it is a source of energy for the human body. In sports where short-term but very intense '''anaerobic''' efforts, such as weightlifting, gymnastics, swimming in short distances or speed races (100 to 400 meters), become the "turbo" you need The body to give more of itself