One week after the L.A Times rated the accuracy of several fitness bands, the New York Times tells us what’s good and not so good about activity trackers. First, the Times tells us, it’s important to bear in mind that activity trackers track exactly that: activity. They do not track exertion. This shortcoming works well with things like number of steps taken, but not so well with training exercises like lifting weights. As the Times points out, the motion from eating chips can appear to be as vigorous as bicep curls. Hmm, maybe that’s a good thing. And when it comes to cycling, activity trackers are pretty useless. The Times piece, however, with lots of interactive charts and graphs, is anything but useless. Read more here.