on binary tracking algorithms—moving or not—so they generally can't tell the differ- ence between a steady jog and vacuum- ing the living room. The Amiigo is the first tracker that can discriminate between exercises, tally reps, and accurately tabu- late calories burned. The device consists of a shoe

s that data to determine what kind of exercises the wearer has done (barbell curls versus hammer curls, for example) and how much of each one. The Amiigo recognizes more than 100 exercises, but the company plans to release app updates to include more—from sit-ups to bat swings to Frisbee tosses. E