everybody. You know how I'm always saying, everybody's got something, which inspired my book that comes out on Tuesday. Very, very excited about that. But my good friend, ESPN's Stuart Scott, he has... See More
everybody. You know how I'm always saying, everybody's got something, which inspired my book that comes out on Tuesday. Very, very excited about that. But my good friend, ESPN's Stuart Scott, he has something. He is battling the cancer for a third time. When I say battle, I do mean battle. Sparring in a mixed martial arts gym. Continuing to work, raising two teenage daughters. I shared a tremendously inspiring afternoon with Stuart, who is doing more than surviving. He is absolutely thriving. Boo-yah. What's going on, stu? Reporter: He's an ESPN original. Boo-yah. Reporter: Stuart Scott. The man "Gq" says put the hip-hop in sports casting. These days, when he's not working here, a few times a month, you'll find him here. Practicing mixed martial arts. The sunglasses, not to be cool, although he is. I'm blind in my left eye. Contrary to what people on Twitter say, it is not a glass eye. Reporter: My momma says, everybody got something. But it could be my dear friend, Stuart Scott, who came up with the phrase. You want to work. I want to work. And thinking, cancer. Shouldn't that be the last thing you want to do? You get it. You get it. You want everything to be as Normal as possible. Let's go back for people who don't know, what's your journey been like so far? Winter 2007, that was just a surprise, when the doctor said, we did a biopsy on your appendix, and you have cancer. Like, the first thought, I'm going to die. There's probably an expletive before the thought, I'm going to die. Can't say it. My second thought was, I'm going to die and I'm going to leave my daughters. And I can't do that. Reporter: Two surgeries and six months of chemotherapy, stu emerged cancer-free. But it came back. At least for me, this is likely not going to be something I'm ever going to kick. So, now what? Reporter: When you say, you think rite's something you're never going to kick, you don't want to know the prognosis? It doesn't matter to you? I don't want to know how many years you think I may have left. How many months you think I may have left. Let's say it's stage iv, it's going to make me scared. More scared. I don't need that. Reporter: So, he comes here. And he fights. Fights his trainer, Darren. And he believes, beat back the cancer, that wants to ravage his body. Doesn't it feel good, though, to be winded? It feels good to be winded. Reporter: Yeah. Having trouble breathing. Reporter: Yeah. Chest hurts. Reporter: You're alive. I'm alive. Reporter: Your two precious daughters. You always light up, stu, you always have. And I know most parents who face something that you're facing, that's what you think of. I know they feel very strong, real scary, worried thoughts about me. I know that. But I worry about them because I don't hear much from them about it. Reporter: And what about you? You're their daddy. And I know that is your chief motivation to stay here, for them. So, how do you deal with it? That's my focus. Why do you want to stay alive? For them. I want to walk them down the aisle. I want them to call me when they're 26 years old and they want a condo that they can't really afford. I want them to call me and say, dad, can you give me a loan? I want to say yes. That's what I want. That's what I need. Really need. That's what I always wanted and needed, with them, for them. Is to be dad for a long time, as long as they need a father. Reporter: How are you able to physically get in that ring after chemo? It's for the mind, better than any chemo, to me. For me, it's better than any kind of medicine. Reporter: Is it your way of standing up to cancer? It's my way to try to kick cancer's ass? Can I say that? Reporter: His schedule would exhaust most totally healthy people. After the workout, he takes me to pick up his youngest daughter, Sidney, at school. It's the most important thing I do. I'm a dad. Reporter: Today, I get to see the proud daddy glow, as his baby sings in the chorus. ♪ You can take everything I have ♪ ♪ you can break everything I own ♪ Reporter: Tears. But not tears of sadness. Tears of joy. Tears of pride. Tears of a man who's very much alive, living his life, and with a fierce determination to fight. Boo-yah. Take that, cancer. ♪ And that's his daughter, Sidney, singing "Skyscraper." I have to tell you. He did "Sportscenter" at 11:00 P.M. It was a full day. There's a difference between being alive and living. And that is exactly what he is doing and showing people. He's very active with the V. Foundation for cancer research. And just showing people that, yeah. Yes, yes. You can do it. Yes, you can. Keep on fighting. It is. So inspirational. I should have brought Kleenex. You I saw you nodding along when he was talk about his children. You're fighting to see them and see them grow old. Thank you, stu. Love you. Thank you for sharing that story with us.
This transcript has been automatically generated and may not be 100% accurate.