For The Uncompromising Uncommon Sports Fan

Talk about "unplanned."

"Humans have engaged in endurance running for millions of years, but the modern running shoe was not invented until the 1970s," Lieberman said.

Runners have collectively logged 93 million miles on nikeplus.com.

Bolt and Gay avoid Brussels clash

"I wouldn't say I've followed him, but he's hard to ignore as he keeps telling me how fast he runs," said Bolt. "It's not a fight for me, it's a race. I am just competing. Who is faster? I am going to say me." Gay, meanwhile, has said he is "preparing for battle" ahead of the pair's expected mouth-watering clash in Sunday's 100m final.