"A special class of fitness trackers appeal to people who have mastered taking 10,000 steps per day and want more information about their bodies than what a basic tracker provides. The Polar A360 ($199.95) fits right into this category, and it's one of the more attractive options available. The waterproof, wrist-worn A360 includes an optical heart rate monitor (HRM) and a number of smart features that coach you toward meeting your goals every day. It also supports push notifications from Android and iOS. And the way the A360 displays heart rate both on the band during activity and in the app after makes it easy for novices to actually put that data to use. While Polar's companion app, Flow, used to be finicky and difficult to use, recent updates have improved it measurably. That mak"
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