Goldberg is just days away from stepping into the ring with Brock Lesnar at WrestleMania, and it's been a tough road back for the 50-year-old champion. 

The WWE Universal championship title belongs to Goldberg for now, something he wanted to share with a family that never got to see him tearing through WCW in his prime. That's come with some serious sacrifices, and Goldberg didn't shy away from telling it like it is. 

The man who owns the longest winning streak in professional wrestling history has been pushing himself in the gym, working to get back to the trademark mammoth size he once was. The process has left him "miserable," he revealed in a very candid interview.

Goldberg joined Edge and Christian's E&C Pod of Awesomeness, discussing his return to the wrestling world. On review, there seems to be very little that Goldberg is enjoying about being back in black. Quotes from the episode were transcribed by Wrestling Inc.

"I am nothing but a machine now. I get up in the morning. I eat. I train. I eat. I go to the bathroom about 20 times intermittently throughout the day because I'm shoving 15 to 20,000 calories in my body and it doesn't know what's going on. At 50 years old, it has no idea," Goldberg said. 

The WWE recently shared an inside look at Goldberg's workout routine, and he alluded to the stress his workout routine is putting on his body. His muscle mass was dramatically down after being away for 13 years, instead focused on cardio.

Goldberg's had to flip that script, and the process has left him feeling "miserable." The way he describes it, it's easy to see why. 

"I'll be honest, I'm miserable. I'm absolutely miserable. But my family's having fun, man. And so, every single thing, every training session, every ART massage that makes me cry, every muay thai session, it's all worth it, man. It's just worth it."

Finding silver linings in the madness is just about the only way to push through what seems to be a grueling process leading up to a single WrestleMania showdown. Coming back from such a long absence from anything is never easy. 

It's so hard, in fact, that Goldberg even admitted that he forgot how to go through his classic entrance routine and even pulled a hamstring during a simple kick. 

"When I came back to the WWE, each and every time I went through Gorilla [position], I would remember another thing that I had forgotten in my preparation."

Gorilla position refers to when a wrestler is behind the curtain and next to make their entrance.

"I throw my punches. I throw my kicks. I pull my hamstring throwing a kick! Throwing a kick! It's ridiculous."

It sounds like being a 50-year-old wrestler is, undoubtedly, a miserable experience.