Getting the most out of your workout means getting your heart pumping at just the right rate. Unfortunately, most pulse-monitoring gadgets require a chest strap, which isn’t the most conducive for those who just want to get out there and run. The Mio Alpha wristband gets around this obstacle by implanting two optical sensors in the underside of the watch, which then see how much blood is flowing. A quick glance down at your wrist not only tells you your time, but also your heart rate and if you’re in the zone. The watch can also pair via Bluetooth with a number of fitness apps already on the market, so you can track your progress. The Alpha looks pretty good on your wrist, too.