![11tegen11 on Twitter: "I don't mean the obvious heart rate monitor we saw KJH wear. But something like this image shows, a GPS vest? http://t.co/DqWyBIq9CY" / Twitter 11tegen11 on Twitter: "I don't mean the obvious heart rate monitor we saw KJH wear. But something like this image shows, a GPS vest? http://t.co/DqWyBIq9CY" / Twitter](https://pbs.twimg.com/media/CGwpF3RWQAAyeAy.jpg)
11tegen11 on Twitter: "I don't mean the obvious heart rate monitor we saw KJH wear. But something like this image shows, a GPS vest? http://t.co/DqWyBIq9CY" / Twitter
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Set of sports items, heart rate monitor watch and chest belt on white background Stock Photo - Alamy
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