Arguably the hottest item among Tour professionals this year hasnt been the latest driver or longest ball. In fact, this product doesnt even help golfers hit their shots. But, it does make them better players and more-focused competitors. The WHOOP Strap 3.0 has been on the wrists of several Tour winners this year, as well as throngs of other pros -- none of whom get paid to wear it. Think of it as an ultra-advanced, state-of-the-art fitness tracker.

What started as a performance monitoring tool solely for elite athletes began catching on with the worlds top golfers three years ago. As they travel from one event to the next which in itself can take a tremendous toll on their bodies -- Tour pros perpetually seek an edge to improve their games and stay ahead of the competition. Gushes one top player: Right from the start, I realized WHOOP was an unbelievable tool to evaluate my process and help me prepare each day.

Thankfully for you, WHOOP is now also available to the masses. So, how exactly does it work?

Where other wearables monitor the basics like step count and heart rate, WHOOP goes well beyond -- giving insightful feedback through its Bluetooth-paired smartphone app on how your mind and body are adapting to external stressors. Among other things, stress can manifest itself in sleep quality, heart rate and heart rate variability . WHOOP tracks these physiological phenomena and translates that data into actionable recommendations.

Lets start with sleep. If yours is lacking, its almost certainly affecting you on the golf course. WHOOP evaluates your sleep quantity, quality and efficiency, then coaches you to a better nights rest by suggesting how much time you need to spend in bed. After all, chronic sleep debt reduces your mental and physical capacity that in turn lowers your performance level. Additionally, WHOOP tracks your sleep cycles and stages nightly, telling you how much time you spend in each. Tour pros using it aim to get 40-50 percent of their total sleep in deeper stages, so they can fully leverage physiological and psychological capacity in competition.

WHOOP also measures strain -- the cardiovascular load you put on your body. It opens a window into how quickly or slowly youre using up the proverbial fuel in your tank, and lets you know the exertion level you should aim to achieve each day. Managing strain and understanding how it builds is paramount in reducing any uncertainty around your performance levels. On the WHOOP app, you can see your live strain measure, heart rate and caloric burn all in real time, and even share performance analysis with your coach or swing instructor.

The thing that really sets WHOOP apart -- and the metric that many Tour pros find most valuable -- is the daily recovery score. Taking into account your previous strain, sleep and a number of other key physiological factors, it gives you a percentage from 0-100 (broken down and color-coded as red, yellow or green) indicating exactly how ready your body is to perform that day. Using the WHOOP recovery metric as a training guide enables golfers to ensure theyre in the green when it matters most.

Ultimately, WHOOP is an information portal to your body that lets you know ahead of time when youre primed to swing the club effortlessly, zero in on all of your targets, and think clearly out on the course. By taking your most advanced biometric data and presenting it to you in uncomplicated language and easy-to-understand graphics, its like having a personal trainer right on your wrist.

Click here to sign up for a six-month membership using promo code GD15, and WHOOP will send you the device for free. Then youll see why two of the worlds top four Tour pros rely on it -- and how it can transform your game, too.

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WHOOP: WHY ITS TAKING THE TOUR BY STORM, AND WHAT IT CAN DO FOR YOU - GolfDigest.com