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Still, his legs will feel very different at the start of the marathon in Hawaii after the swim and bike.

“I have no doubt in my mind he can accomplish this and actually do very well,” Newby-Fraser said.

Fitting in time to run during his busy travel schedule was feasible for Ohno, who makes frequent trips to Asia for his various business ventures. Finding places to bike and swim - not to mention the extra hours needed for training three disciplines - is a bit more vexing.

Ohno so far has been doing about 10 hours a week of training. Newby-Fraser hopes to get that up to 14-16 hours. By July, it will need to be more like 20 hours. Three-time Ironman world champion Craig Alexander will also help coach Ohno.

He’s noticed that the training makes him feel mentally sharper at business meetings. Not that he also doesn’t feel exhausted.

Ohno had bulked up his upper body since last competing at the 2010 Olympics, which isn’t conducive to endurance sports. He was in decent shape by most people’s standards when he started his Ironman training. But Ohno’s idea of a good workout before was going to the gym for less than an hour.

His progress will be documented in an eight-episode online series. Ohno figures it will capture plenty of failures along the way, but maybe seeing an elite athlete humbled will inspire others to push their limits.

Ohno has kept plenty busy since Vancouver: hosting “Minute to Win It” on the Game Show Network, commentating for NBC at the Olympics.

But it’s hard to give up the rush of competition.

“I need something like this in my life,” he said.