WRIST-MOUNTED HEART RATE MONITORS
Your heart rate is a prompt, reliable way to measure how hard you're working, and whether you should increase or decrease the intensity of your workout. Analyzing data post-workout will also help you track your fitness gains and calibrate your future workout. Until recently, the only way to accurately measure your heart rate was with a cumbersome and uncomfortable strap around your chest that connected wirelessly to your sports watch. Fortunately, the new generation of watch-mounted sensors are accurate enough to forgo the strap entirely, giving you a solid reading directly from the pulse in your wrist. A decade from now, young athletes will laugh at the fact that we once had to run with elastic straps on our chests