Activity Tracker Information Requests in Discovery: Is my watch a smoking gun?

As I check my watch while writing this post, I look to see how many (how few) steps I have taken today, and the paucity of activity dots that mark the minutes of this hour tell me that I have been sitting, inactive, at my desk for far too long. My lack of exercise today notwithstanding, the watch on my wrist (and the corresponding app on my phone) contains a treasure trove of information that can be extremely useful – not only in the context of attempting to keep me active and healthy, but also in terms of litigation.