Terry Collins, writing for CNET:

Medical researchers at Harvard University have created an app that lets former players share how on-field injuries may still be affecting their brains and bodies.

Ex-players spend about 20 minutes a week with the app, called TeamStudy, recording their pain tolerance, mobility and memory. The broader public is also encouraged to use the app so researchers can compare the health of nonathletes to that of the former players.

Great use of HealthKit.