Look closely because they are both inside that little green thing attached to my new Mizunos. I can't believe I didn't know anything about this miracle before, but within 48 hours it has revolutionized my running. (Sorry, Dr. Audra I couldn't lay off running for too long.) For my birthday my wonderful boss gave me a
Nike+ for my ipod which is two parts -1. has a sensor for my shoe and 2. is attached to my ipod. The sensor tracks my every move so at anytime during a run it can tell me how long, how fast and how many calories. It's got a whole host of other features which I have yet to try except for the feature where Lance Armstrong comes on after a run and says "congratulations, you're the best runner ever" or something like that. Anyway, it's an outside runner's necessity.