Too Much Exercise Delays Pregnancy in Normal-Weight Women, Boston University Study

Exercise is a plus for women trying to become pregnant, but overdoing workouts might make it harder to conceive -- unless you're overweight, researchers report. Usually a risk factor for most health problems, being overweight or obese didn't hinder fertility in heavy women who logged vigorous workouts -- running, fast cycling and aerobics. However, healthy-weight women who performed more intense workouts were more likely to experience delays becoming pregnant.

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