Simmons's rep tells PEOPLE the fitness guru, 63, is "fit as a fiddle" despite his thin appearance on DWTS

By Alexis Chiu and Dahvi Shira
Updated October 11, 2011 04:30 PM

Richard Simmons isn’t slowing down anytime soon.

Even though the fitness guru, 63, had bloggers buzzing after an appearance on Dancing with the Stars Monday night – during which he looked especially thin – his longtime rep Tom Estey tells PEOPLE, “He’s the healthiest he’s ever been.”

“He’s actually at the weight he was when we launched the original Sweatin’ to the Oldies,” Estey says of the workout videos that skyrocketed Simmons’s career in 1988. “He is completely healthy, happy and fit as a fiddle.”

Simmons – who currently has a dance studio in Beverly Hills and offers his signature Slimmons classes to the public – is apparently doing well in all aspects of his life, including his personal crusade for the passage of the Fit Kids Act, which would help fight childhood obesity by strengthening physical education classes in the nation s schools.

“He’s happy,” Estey says. “Everything with him could not be better.”