trackandfieldnews.com

N7n6P TIL that the belief that "lactic acid" causes muscular "burn" while exercising is FALSE. It's actually "the breakdown of ATP for energy creates the release of hydrogen ions in the bloodstream" that causes the burn.
XELDP TIL that up until 1954, no human had ever run a sub 4 minute mile. Since Roger Bannister broke the barrier in 1954, 1400 men have since eclipsed the 4 minute barrier.