There may be three reasons for acne in general fitness: ① Fitness accelerates the metabolism of sugar, fat and protein in the body and consumes more vitamin B. Lack of vitamin B will lead to fat metabolism disorder, so vitamin B needs to be supplemented more; (2) Pay attention to hygiene, including training clothes to change frequently and training logistics to wash hands and bathe; (3) Replenish water, training consumes a lot of water in the body, so pay attention to replenish water, otherwise the metabolites will not be effectively excreted.