I know loads of people probably exercise and breastfeed but i just wondered if anyone knows how much is safe and won't affect the milk? I'm a runner and was wondering if a few 5k runs a week would be ok? I can always do less if needs be but want to get back into it as much as i can get away with really. I didn't bother getting back into it last time until after i stopped because i had pnd... but i think if i'd run it might have helped the pnd.