Will LeBron Be Sharapova's Ball Boy?

In a new campaign to get people working out (as well as buy shoes), Nike has launched NikePlus.com, a new website that will track runners' New Year’s resolutions and challenges from friends. If they fail to keep their commitment, selected runners will face consequences and have to do weird things that their friends decided they will do before hand. But the big push here is from LeBron James and tennis star Maria Sharapova.

During the month of January, the two athletes will try to run more miles than the other. If Sharapova loses, she will have to sit behind James during a game and be his water girl. If James loses, however, he will have to be a ball boy at one Sharapova’s matches. The contest ends on January 31 and you can track their progress at NikePlus.com.

Click here to view Maria's new years resolution