"Data is nice, but understanding is better" Jawbone health platform product manager Andrew Rosenthal tells us, snapping his black UP24 around his wrist. You can't accuse the former MIT hacker of lacking confidence about either his employer or its product, the wildly successful UP range of fitness trackers now among the best-known wearables on the market. Nor can you doubt his enthusiasm for that data's potential to amount to far more than a tally of your steps. "Tracking is the data, and that's really important to get right, but that's table stakes at this point and we've spent the past two and a half years getting that right" Rosenthal points out. "The reason Jawbone's going to win in this space, the differentiator in the market, is going to be the ability of companies to make sense of the data, to put it in context, and then to help their users actually act on it, and change their behavior."