By Keith Idec

Cynics are already dismissing it as Floyd Mayweather’s way of helping sell what much of the public perceives to be an ill-conceived mismatch.

Nevertheless, Mayweather told FightHype.com during an interview posted Tuesday that he is feeling the effects of his first training camp in two years and that he doesn’t feel like the same fighter he was when he last boxed in 2015. The 40-year-old Mayweather is several weeks into what he says has been a harder-than-expected training camp for his highly scrutinized boxing match against UFC superstar Conor McGregor on August 26 at T-Mobile Arena in Las Vegas.

“No matter what happens August 26th, I can’t do it anymore,” Mayweather said. “I can’t do it anymore. Too much wear and tear on the body. It’s too hard for me. I can’t do it anymore. I’m just telling people the truth. I can’t do it anymore.

“My body is pushed to the limit. It was cool in the beginning. I was like, ‘Yeah! Yeah, I’m ready to get back in shape.’ It’s tough. I’m not the same fighter I was two years ago. I’m not the same fighter. So that’s what makes this – it’s gonna be interesting.”

His age and inactivity notwithstanding, Mayweather (49-0, 26 KOs) is more than 5-1 favorite over McGregor (21-3, 18 KOs in MMA), who’ll turn 29 on Friday. The undefeated five-division champion still is expected to earn well over $100 million for this 12-round, 154-pound bout against McGregor, which Showtime Pay-Per-View will televise ($99.95 in HD).

With about seven weeks to go before he meets McGregor, Mayweather looked tired as he spoke to FightHype.com during a flight on a private jet.

Famous for always taking training seriously, Mayweather sounded almost as if he regrets accepting the McGregor bout because of the toll it is taking on his body. Mayweather was 38 when he last prepared for a fight, a 12-round unanimous-decision victory over Andre Berto (31-5, 24 KOs) in September 2015 in Las Vegas.

“This is my last one,” Mayweather said. “I thought this was what I wanted. I said, ‘Yeah, I don’t mind. I’ve been off.’ It’s rough. It’s rough.”

The Grand Rapids, Michigan, native has come out of retirement twice, but insists that the McGregor match will be the last of a Hall-of-Fame career that began in October 1996.

“I know,” Mayweather said. “I know. I know. This is the last one, ladies and gentlemen. I can’t. I can’t. My body is, it’s just – it’s grueling. It’s grueling. It’s just I can’t. It’s too much.”

Mayweather also said that trying to run businesses while committing so much time to training also has proven to be a difficult chore.

“I’ve got different businesses that I run day-to-day,” Mayweather said. “Trying to train and run the day-to-day businesses, it’s hard. It’s hard to juggle. You know, I have a gentlemen’s club, which is ‘Girl Collection,’ a gentlemen’s club that’s bringing in seven figures a month. And anyone that’s ever stepped foot into the doors, I just wanna say thank you for the support.”

Keith Idec is a senior writer/columnist for BoxingScene.com. He can be reached on Twitter @Idecboxing.