Gabriel Koepp, the program manager of research operations at Arizona State University’s Obesity Solutions center, tells me I’m not alone: 90 percent of people who try some kind of fitness trackers stick with it for three weeks to two months, he says, and then stop using it. Its cool to see at first, Koepp says, but then the information the device gives a user isnt valuable anymore and people lose interest. That still leaves 10 percent, who he says will use one tracker to make lasting change in their lives. The brand of tracker is nearly irrelevant — for some people, all they need is a constant reminder of their progress, and that’s enough to keep them on track for years. The Jawbone Up24 and the Nike+ Fuelband SE are both trying to do this — the Up24 wants to wow you with data you didn’t know you wanted, and the FuelBand SE makes movement a game.