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Mice born to mothers that run during their pregnancies grow up to be rodents that love to run as adults, according to a thought-provoking new animal experiment, while pups with sedentary moms had a less-enthusiastic attitude toward exercise. Though it’s a long way from mice to people, the study’s findings hint at the possibility that to some extent our will to work out may be influenced by a mother’s exercise habits during pregnancy, and begin as early as in the womb.

Most of us have probably observed that activity patterns tend to run in families, a situation that has been confirmed in studies involving both people and animals. Children whose parents are sedentary often tend to be inactive themselves, whereas parents who are physically active typically have children who move around and exercise often.

Logically, home environment and nurture influence familial activity levels; children learn from and mimic their parents.

Recent science, however, suggests that there are other, deeper biological influences at work as well, including genetics. A number of studies have identified various snippets of DNA that, if someone carries them, predispose that person to be quite active, while other gene variations may nudge someone toward being a couch potato.
http://www.goreadus.com/health/does-exercise-during-pregnancy-lead-to-exercise-loving-offspring/