Too little or too much exercise can definitely affect fertility, especially if your workouts are having a significant impact on your body fat. A critical amount of body fat is needed to reproduce, and anything above or below this critical level can affect fertility. Moreover, the stress associated with excessive exercise can also add to the effects of lower body fat in suppressing one’s ability to reproduce. But a moderate amount of exercise can help to lower stress and can even lead to a healthier lifestyle. I encourage women to get in a healthy amount of exercise when they’re seeking to get pregnant. If you ever have any questions about much is “too much” exercise to do while trying to conceive, you should always consult your physician directly.