I think this is great! If anyone enjoy running and and has a Apple Ipod Nano, I would suggest getting the Nike Plus. I use it and set up my own username and profile online and create "challenges" with fellow friends, such as "the fastest mile," or "20 miles in one month."
If you don't know what the Nike plus is its a small reciever that goes in your shoes and the other part goes in your nano and tracks how far and fast you run. It gives you stats and you can compare them to fellow friends. I use it to make bets.
Currently My boyfriend and I created a challenge who can run 20 miles first. I normally run about 5 miles a day so I can knock that out in a week. If I beat him, he has to make my bike payment
It keeps the relationship fun and challenging as well as healthy.
If other have it please add me! My username is Flipmutt as well.