This is what sadistic must look like.

Men and women dancing so hard and fast atop canary yellow exercise bikes their perspiration looks like rain.

They are jammed so close it’s difficult to maneuver between them but somehow instructor Keith Thompson manages. He offers high fives. He gets in-your-face. He motivates, sometimes singing, other times dancing or both to soundtracks of Rihanna, Lil Jon, and Bruno Mars.

Watching you know why Thompson and the cycling classes he calls KTX Fitness have generated a following that even he didn't anticipate. In just seven years, he has become a You-Tube sensation so popular metro Atlantans show up an entire hour early to secure a place in his classes. Fans are crossing state lines to experience the class first hand and fitness clubs are taking notice.

“I just stepped out in faith,” he said recently after another hour-long class at the Adamsville Recreation Center.

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