Oh please, More than 10 miles isn't unhealthy. And what's wrong with running six miles at night time? During CC season, we would do two miles warm up, then do a ten miler, then finish off with some suidices (sp?). And myself, I've once ran ten miles with two pounds weights each arms. I know it doesn't seem that much, and I thought same... But, I swear, I thought I was gonna die around eighth mile. Running improves your overall fitness. Well, I'm on my HS XC team. 17:30 5k and 5:01 mile to my credit, but I know I can do much better than that. This track season, I'll probaly do 3200. I don't know about my max... I can do three sets of 95 pounds 15 times, if it means anything. Also, I'm shocked by the amount of CC runners on this forum...