In the past few months, we have covered plenty of fitness gadgets and apps here. Fitness watches are nothing new. Not all of them are capable of serving as an intensity and recovery trainer. The LifeTrak Zoom HRV does just that. It measures heart rate from your ankle, wrist, or arm and monitors your physical fatigue.
The device is waterproof. When used around your ankle, it provides you with cadence and other cycling data. The device is also a sleep analysis tool.[where to get it]