During an interview with GQ, John Cena spoke about having lost 20 pounds for a movie called Snafu.

"I say yoga because that’s the closest, but it’s like a stretch routine. I did a movie with Jackie Chan about three to four years ago and they could care less about how strong I was. They just wanted me to kick over my head, which was impossible. I went over there to train with him for about three months and they stretched me like taffy. I immediately lost 20 pounds, which was very difficult for me. I even fell into a weird depression because it was like I’m losing everything that I worked on for 30 years! But I begin to walk taller, begin to have less pain, I was more flexible, and that experience changed my life in many ways, and it taught me the value of making sure your body moves okay."

"In yoga, the concept is that you need to be present because we’re going to stretch you farther than you think you can go. If you’re afraid, then you’re tense. You need to be relaxed and present. Just those two things; relax a little bit and be present. That’s why I relate it to yoga: It's helped me balance a lot of what life throws at you."

Cena continued.

"If anything, [wrestling] allows you to be healthier because you have to be there for the shows, but you have so much time during the day. You’re on the road all the time but I have such a network across the world of gyms to go to and healthy places to eat that the road actually becomes your home.

"But my training has switched a lot because I’m old. I’m going to be 45 this year. I started lifting weights in a dedicated fashion when I was 12 years old. If you do the math, I’m coming up on 35 years of that. That’s a long time. The biggest shift when I was in the WWE is, every day, I tried to be the strongest version I can be that day. Now, I’m trying to be able to lift weights when I’m 80, so I need to take a little bit more care of myself for the long term. I have a 40,000-foot perspective. It’s a lot more work on flexibility and a lot more warming up. The stuff that I hated to do? I’ve learned to like just because it gets me feeling good for the stuff that I like."