Your behavior. Obviously a persons gender has nothing to do with fitness. One can be fitness in both genders. The environment either as nature or the environment as what you're surrounded by (people, influences) could potentially be a factor of good fitness because if a person isn't surrounded by good influenced, then they would have no real motivation. On the other hand, heredity does have an impact on ones fitness. But I think that your behavior, your attitude, the wasy you carry yourself has the biggest impact. So either a or d
