Too much exercise delays pregnancy

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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. Dimitrios Mastrogiannis, associate professor of obstetrics, gynecology and reproductive sciences at Temple, said, "Obesity is a different ballgame. Different hormones are playing around in obesity -- fatty tissue produces more female hormones, more estrogens."