Michael Conlan has set his sights on running a sub three-hour marathon - but only when he has retired from boxing.
The Belfast fighter is currently in camp as he prepares for another world title shot on May 27 against Luis Alberto Lopez at the SSE Arena.
The bout was confirmed last week but has been in the pipeline for a couple of months.
Read more: Carl Frampton offers measured prediction for Conlan vs Lopez world title fight
Conlan kept active as he awaited confirmation by staying in the gym and doing some road running.
He even ran the Brighton half marathon in under one-and-a-half hours, and that was with limited sleep after he attended Floyd Mayweather's exhibition fight with Aaron Chalmers the night before.
Conlan admits his competitive edge always emerges when he is putting in the miles.
"I did a 10k recently in 37 minutes, but I was aiming for 35. I got stuck behind some other runners at the start which messed things up," Conlan said.
"I did the Brighton half marathon in 1hr 24mins, and I will do a sub three-hour marathon when I do get round to doing one. But that will happen after boxing.
"I don't want to f*** myself up because I go hard at it. On that Brighton run I just went off with the other runners at the start and I was mentally breaking them.
"I was wearing sweat gear and jackets and everything, and only had four hours' sleep and no fuel after the Mayweather thing."
Conlan is a fighter dedicated to his art.
He puts his body and mind through agony during intense training camps for his fights, but away from the competitive arena he rarely has a day off.
"Life is a camp. You can't be a part-time athlete and just train when a fight is coming up," he adds.
"It is 24/7 and it's a lifestyle. I was doing all that running recently, but I do that because I enjoy it.
"It is not for training. I like exercising. And obviously I have been in England training over the past seven weeks as well."
Looking ahead to his world title showdown with Lopez, Conlan said: "I have been training since February, just working and getting better.
"But now I can focus on the opponent. He is a fantastic fighter and a very dangerous fighter.
"He is very unorthodox and throws some crazy shots, so it won't be an easy fight. But it is a fight I believe I can win, and I can win comfortably.
"I just need to make the right decisions at the right times."
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