Vin Diesel

Every actor has their own process. For me, I really need to stay in the pocket. So, if I'm on set and I'm in character, I'm not thinking like a producer. If I'm on set and I'm not in character, wardrobe and make-up, and I'm just coming on set for the moments that I'm not shooting, then I'm able to be the producer.

It's not just the physical aspect of boxing, it's the whole fighter mentality that has been ingrained in me through the years as a competitive athlete. One of the hardest things you'll ever do is to box - to get into the ring and to face off with somebody whose whole goal is to knock you out, to hurt you, and to be able to fight back.

The closer I get to retirement, the more I feel it will be a huge change, a shock, because athletics has been the core of my whole life. I know I'll miss the feeling of running fast, the adrenaline rush, and hearing the crowd cheering me on.