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Athletes wear custom-engineered Nike trainers in attempt to break two-hour marathon barrier
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Nike Jumps Into Barefoot Running With a New Knit Shoe | WIRED
Nike Free 4.0 Barefoot Ride Running Shoes Blue Navy 729818-401 Men's Size 10 | eBay
Nike Jumps Into Barefoot Running With a New Knit Shoe | WIRED
How to strengthen the muscles on your feet with Nike Free - Top4Running.com
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Nike Free 4.0 Barefoot Ride Running Shoes Blue Navy 729818-401 Men's Size 10 | eBay
Do Nike's New Shoes Give Runners an Unfair Advantage? - The New York Times
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Tips for Buying Minimalist Barefoot Running Shoes. Nike.com
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Tips for Buying Minimalist Barefoot Running Shoes. Nike.com
