WALNUT, Calif. – A blazing Southern California sun beat down on the Mt. San Antonio College track on a windless Tuesday, and even for someone accustomed to training in the Caribbean, this was really, really hot.

"Hotter than Jamaica," Usain Bolt said, wiping his brow.

It didn't help that Bolt, the Jamaican sprinter who is the fastest man in the history of track and field, the world recordholder in 100 and 200 meters, wore black jeans, a black polo shirt and a black "UB" baseball cap.

But he was having fun anyway.

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"I always have fun with the kids," said Bolt, who appeared at the college, home of the annual Mt. SAC Relays, to conduct a clinic staged by his shoe sponsor, Puma.

"I really enjoy coming out and trying to teach them a few things and trying to inspire them. For me, it was good to be inspired as an athlete growing up. I enjoy it."

Bolt, who is making a few more appearances in Los Angeles this week before returning home and enjoying a month or so of a break in training, was relaxed in his role as teacher.

Bolt, who earlier this year repeated as...