It is enough to contact Ken twice a week, but only if you do enough or achieve the effect of stimulating muscles. Generally speaking, the recovery time of muscles is 48 hours to 72 hours. Therefore, it is best to exercise one muscle group every two or three days, otherwise the effect will be counterproductive this time. In addition, it is also important to exercise other muscle groups in the whole body. Many people only practice chest muscles and shoulders, but ignore the exercise of lower limbs, which is not correct. Full-body exercise will coordinate the development of all your muscle groups and promote growth.