Eric Cheung was a pretty competitive amateur runner, completing 5K races in about 22 minutes, when he noticed about five years ago that his times were dropping despite consistent effort. He was inching into his mid-30s, but lots of runners get older and still run what they used to. Cheung was having trouble breaking 25 minutes with maximum effort.
Is Philly’s 5K Run for Clean Air the Greenest Race in America?
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