What I would be afraid of, here, is that if there are signs that big data can uncover that peel out some catastrophic disease from your workout data that would

What I would be afraid of, here, is that if there are signs that big data can uncover that peel out some catastrophic disease from your workout data that would mean your insurance company knows you're very ill long before you do... It would extremely tempting not to do something about that knowledge that helps the company even if it hurts a soon-to-be-dead-anyway person.