When I was 30-32, I got up at about 04:30 - 05:00 every day. For the first few years, I ran 9km every other day, but I switched to using an elliptical trainer f

When I was 30-32, I got up at about 04:30 - 05:00 every day. For the first few years, I ran 9km every other day, but I switched to using an elliptical trainer for 30 minutes every morning (including weekends) after I started getting shin splints from running. In both cases, I would do some work with free weights every other day. That was when I had a systems engineering job with very consistent, predictable hours. It's a lot harder to maintain that kind of schedule when there are crunches and other factors that interfere with a routine. It's certainly possible that some or all of the CEOs in question are distorting the facts, but it's not out of the question that they're accurately describing their day.