Don't get us wrong here. Exercise is a healthy and important part of one's daily life no matter whether you're considering getting pregnant, are pregnant or have already given birth [source: WebMD]. It helps fight fatigue, staves off diabetes, boosts energy and strength, and can even help prevent backache. But, too much or too little exercise can be harmful. Excessive exercise can cause the body to burn too much body fat, which in turn can thwart regular ovulation and menstruation.
On the other hand, too little exercise can lead to obesity and diabetes, which also negatively affect a woman's ability to conceive. Instead, try doing approximately 30 minutes of regular exercise every day throughout the week [source: The American Congress of Obstetricians and Gynecologists]. If high impact exercise like jogging or P90X simply isn't your idea of fun, try walking, swimming, cycling or yoga.