Calvin McDonald, 47, the chief executive of Lululemon, is obsessed with fitness. Appointed last year to fix the company’s culture after a series of missteps, Mr. McDonald exercises twice a day, competes in three Ironman races a year and goes on four-hour bike rides to clear his head.

A native of Canada, he recently moved to Vancouver, British Columbia, with his wife, Andrea McDonald, and four children. Here, he shares his life tips.

Not Once, but Twice

I’m usually up at 6 or 6:30 in the morning, and I’m usually the first one up in the house. I first look at what I’ve committed to in the day. Then I figure out from there what is the best time for me to get in my workouts.