1. Top Five Competitive iPhone Apps that Create Exercise Habits by Max Zamkow habits.stanford.edu

2. Why Competitive Exercise iPhone Apps? iPhones continue to gain market share and are one of the few items many users carry when they work out Competition keeps users returning to the app to beat old scores / see how their friends are doing Competition motivates users to not give up on their habit formation as they try to climb the rankings / achieve the next goal / beat their friends Competition makes tedious exercise more enjoyable

4. Encourages users to become more active in their everyday lives

5. Just turn it on and put it in your pocket

6. Challenge a Friend, AI Simulator, or compare yourself to the “Best Walkers” in the world!http://www.cpl.uh.edu/index.php/projects/walk-n-play/

8. Encourages users to do more crunches

9. Accumulate points for each crunch by holding the device against your chest

10. “Battle” others to earn more points become the ultimate Crunch Fu champion and appear on the leaderboard!http://www.GymFu.com/

12. Helps users start, schedule, and complete 2-4 week workout programs

13. Invite friends to join your workout group, complete the same program and compete for the highest score!http://www.nike.com/nikeos/p/nikewomen/en_US/training_app

15. Encourages users begin and then increase exercise habits

16. Take the exercise quiz to increase your knowledge about exercise habits

17. Compare your achievements to those of your friendshttp://myfitpulse.com/

19. Automatically let your social graph know about your status and location during your ride and Cyclemeter will read you their responses and encouragement!

20. Race against your previous rides to improve upon your time!http://www.abvio.com/cyclemeter/

22. Local Leaderboards – only friends included

23. Self Competition – competing against previous times

24. Achievements / Badges

25. Direct Competition – most effective