Myth busters. . .great article.

I don't usually post training related stuff as diet is way more important for getting fit...but this is a great article.  Read the part on why walking outside is way better than the boring old treadmill. . .yes, you with the sore knees, I'm talking to you!

http://www.tmuscle.com/free_online_article/sports_body_training_performance/mythbusters_vol_6