Walk, run or bike your way to better health. That’s the principle behind the fitness tracker craze. Fitbits, Jawbones and other fitness wearables claim to motivate and inspire by tracking your fitness parameters. Fitness trackers can successfully track movement but aren’t as accurate when they estimate calories burned. Some users even report gaining weight because they eat too much because their fitness tracker says they burn more calories than they actually do. While there are hurdles in the road for fitness trackers, the technology for wearables is still racing ahead.