Fitness guru Richard Simmons is not clinically depressed.

Simmons' representative, Thomas Etsey, recently spoke to the New York Daily News about his client's condition following the death of his dog and his knee injury.

"The truth is very simple, he has knee injury, and it's serious enough to keep him from doing what he loves most - exercising and motivating others," Etsey explained.

The publicist also talked about the passing of Simmons' dog and said, "The dog passed away a year and a half ago, it's not the issue. He hasn't lost weight recently either. He's presently at the same weight he was when he released his first 'Sweatin' to the Oldies' video. He is not clinically depressed or a shut-in or a recluse."

"It could be like Tiger Woods having a shoulder injury that stopped him from golfing, but in this case it's compounded by a thousand because Richard has dedicated his life to others, and right now he can't exercise or travel and take his message to the people in person," he added.

Meanwhile, Simmons' friends expressed their thoughts over his condition and stressed that they believe something serious has really happened to him, TMZ noted.

"If Richard is really okay and is aware people are extremely concerned about him, he'd pick up the phone and tell them to relax. But he hasn't and we're worried sick," one of his friends told the publication.

Simmons hasn't been seen in public for the past year but recently he posted a message on Facebook to assure his fans that he is doing well, Aceshowbiz noted.

"I am so touched by the outpouring of love and concern I have received today. I have had a tough time dealing with this injury, as it is keeping me from doing what I truly love to do, and it is to teach classes around the world! Keep on sweatin'!"