Appropriate exercise for couples of childbearing age can increase the chances of conception, but excessive exercise may have adverse effects on the reproductive function of both men and women, which in turn may be detrimental to conception. For women, about 30% of estrogen comes from fat cells, and fat levels above or below 10-15% can lead to infertility, so being too fat (or too thin) can alter the sex hormone balance. Norwegian scholars have found that women who work out excessively are three times more likely to have fertility problems than women who work out properly. French scholars have found that women who run an average of 30 miles or more per week are subject to changes in their menstrual cycle and ovulation patterns, reducing their chances of conception. In addition, excessive bumps can affect the production of sex hormones and affect conception. For men, exercise programs that are high in intensity and volume may impair sperm quality. The male brain, pituitary gland and testes interact together to control fertility, and excessive exercise can interfere with the normal function of this system. Exercises such as cycling can squeeze the scrotum, prostate and other reproductive organs, resulting in poor heat dissipation from the scrotum and congestion in the prostate, which can affect normal sperm production. Strenuous exercise can also cause the testicles to constantly oscillate, affecting the sperm production function. Therefore, during pregnancy preparation, couples should moderate low-intensity aerobic exercise, such as jogging, walking, swimming, etc., to minimize strenuous exercise, and men should ride bicycles less often to increase the chances of conception.