Credit: ABC

Richard Simmons is as healthy as ever!

When the 63-year-old appeared on Dancing with the Stars Monday night to coach Chaz Bono, some were concerned about his notably skinnier frame and thinning hair. But the '80s fitness guru is perfectly fine! 

"He's the healthiest he's ever been," Simmons' rep Tom Estey said in a statement, as excerpted by E! Online. According to Estey, Simmons is the same weight he was when he launched his original "Sweatin' to the Oldies" video.

"He is completely healthy, happy and fit as a fiddle," his rep added. "He's happy, everything with him could not be better."

Simmons himself was happy with Bono and Lacey Schwimmer's performance on Monday. Thank you for your kind words about my cameo on DWTS!" he tweeted. "It was so much fun to tape."