THE WORLD’S FITTEST EMCEE

The only thing in front of him is a pile of cinder blocks, an empty parking lot and a one-metre-high cinder-block wall. And for some reason, this has Nick Cannon grinning. He grabs a pair of 15-kilogram concrete slabs, hoists them onto his shoulders, and starts lunging toward the wall. Once there, he stacks the blocks on the wall, then trudges back toward the pile. “This,” he says,