Fortune:

Want an Apple Watch for just $25? All you have to do is get in shape.

That’s the deal several companies are offering their employees, as part of a wellness-incentive program offered through the health-services firm Vitality Group, according to a report in the Wall Street Journal.

There’s a catch, however: You have to use the watch to help meet monthly fitness goals or pay the full price.

Depending on how reachable those monthly fitness goals are, this sounds like a great idea. The only concern I have is, who is collecting the data and how? How do you prove you’re reaching the monthly goals? Is the data automatically downloaded by the company? If so, what safeguards are there in place for the security of that data?