My company every hear has a campaign to get people interested in their health, promote nutrition, the benefits of exercise and to lose weight. They send out a survey with very basic questions and in return give answers to what areas of improvement you should most focus on. They also compare you to those of your peers. Apparently my peers are 64% heathly, and I am 65% healthy. Woo hoo! I'm dominating by a whole percent.
But, the best thing is, just for filling out the survey you get a $50 gift certificate to one of like 200 stores. Nothing like shopping money to incentify me!