WATCH: David Rush breaks the 100m world record for joggling while blindfolded

Guinness set a minimum mark since the record was never attempted before

What the 500th fastest runner in the world tells us about the state of marathoning

Just how much faster have marathoners become?

Michael Norman joins elite company with world-leading 100m in 9.86

The 22-year-old sprinter is only the second person to run under 10, 20 and 44 seconds for the 100m, 200m and 400m