Anaerobic exercise is activity that does not require the cells in your muscles to use oxygen. Anaerobic exercise helps build muscle mass. Lifting weights and yoga are examples anaerobic exercise. Because anaerobic exercise does not use oxygen, it creates a waste product that builds up in your muscles. This causes your muscles to become sore. Muscles can only handle a certain amount of the waste product, so anaerobic exercise can be done only for short periods.
There are many benefits to being active and exercising your body. One benefit of exercise is that you burn calories. Burning excess calories can help keep you at a healthy weight.