In a stats-driven sport like baseball, it seems we know everything there is to know about a player. From batting average to a pitcher's power finesse ratio. Measuring a player's ability isn't limited to his or her skill. There's also a wealth of information in an athlete's body. Wearables that track bio-information have become more prevalent in elite sports, and potentially important to player development and health. How that growing glut of information is used — by the companies that gather it and the teams that use it — remains a concern . No ordinary sleeve In an industrial park in Kent, Wash., near Seattle, it's hard to tell which of the featureless buildings is which. Until you hear the unmistakable pop of a pitched baseball into a catcher's mitt. You know then you've arrived at Driveline Baseball , a training center for players from high school to the major leagues. It has the usual weight room, and pitching and batting cages. But there's also a biomechanics lab and an emphasis
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