After taking silver in the men's wheelchair T52 400 and 1,500 meters at the 2016 Rio de Janeiro Paralympics, Japan's Tomoki Sato decided to make whatever changes he could to reach the top of the podium.With a trimmed-down physique and lighter wheelchair, the 31-year-old set a Paralympic 400 record of 55.39 seconds Friday to win Japan's first athletics gold medal of the Tokyo Games.Believing even the tiniest weight reduction could make a crucial difference, Sato installed a new, ultralight magnesium alloy leg rest on his wheelchair, while replacing iron wheel fastenings with lighter titanium…READ FULL ARTICLE