Aug 27, 2015; Beijing, China; Allyson Felix (USA) celebrates after winning the womens 400m in 49.26 during the IAAF World Championships in Athletics at National Stadium. Mandatory Credit: Kirby Lee-USA TODAY Sports
NEW YORK (Reuters) - Allyson Felix is honing in on her quest for a rare shot at gold in both the 200 and 400 metres at the Rio Olympics, tailoring her training to simulate the stress of her bid and leaning some who have achieved the feat.
A four-time Olympic champion and nine-time world champion in the sprints, Felix is seeking to become only the fourth athlete to sweep the distances at an Olympics.
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