Thanks for the response smt88. The idea would be to use anything that Google Fit tracks so that would include any kind of phone/accelerometer tracking where the data feeds into Google Fit.

Also thanks for the feedback on cross-platform support. Unless the interest in very lopsided toward one platform, the plan will be to roll out on both Android and iOS.

I've love to get your thoughts further on a few things.

1. The bare bones MVP would just be a system that takes your money when you fail to perform. 100% of the money would go to the app. This would cut out the need to build a social network which would cut down the initial production substantially. What would you think about a product like that?

Bare bones example : http://imgur.com/a/H520t

2. On the other side of things, adding more complexity, it's been mentioned to add 'factions' such as Yankees vs Red Sox. The initial user would set up an anti-charity, fail to perform, put money in pot, can continue to be active to rescue some of the money, but there are other players being active to send the money to their team.

more complex example : http://imgur.com/a/Ixc3u

Just curious to hear your thoughts on either of these or any other scenarios where you think it would enhance motivation.

Thanks so much, cheers!