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It’s not easy being Bill Goldberg.

The 50-year-old wrestler, who made a comeback in November 2016, said training at his age has taken a toll.

“I’ll be honest, I’m miserable. I’m absolutely miserable,” Goldberg revealed on a WWE-star-hosted podcast last week. “Nobody get me wrong when I say I’ve been miserable throughout this, but I am. I’m miserable. I’m bloated 24 hours a day. I’m stressed 24 hours a day. I don’t sleep, but it’s a small price to pay.”

Goldberg is known for his reign as a top wrestler in the ‘90s and early 2000s. He retired for about a decade and came back last year. He has defeated Brock Lesnar and Kevin Owens since his return.

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This weekend, he is set to take on Lesnar at Wrestlemania.

“People are expecting me to be able to do exactly what I did back then,” Goldberg said of the upcoming Sunday match. “I am nothing but a machine now. I get up in the morning. I eat. I train. I eat. It’s the toughest thing I ever embarked upon, guys. I’m 13 years removed from the business. I can’t name a power wrestler who has come back 13 freaking years afterwards. And then, within 20 pounds of what he was back then.”