A 28-year-old man has told of how he 'shrunk' fat on his belly and arms, and built leg muscle by taking on an extreme walking challenge.British YouTuber Jack Massey Welsh saw changes in his body after just a week of pounding the streets for an astonishing length of time.Mr Welsh walked a total of 250,000 steps in just seven days, covering an average of 35,700 or 17 miles per day, which is more than half a marathon.
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