What if you made a white labeled incentive health tracking app that can be used by schools to set contests for activities each week. You can have prizes or incentives set for people individually and as groups.

"Who ran the farthest?"

"Who lost the most weight over the school year"

"Who is eating the best"

And allow competition groups in each between friends as well, e.g. A competition for all students to run or bike, but I can do an individual group challenge with just my friends too...

It might be a good way to get value and start setting good habits at younger ages.