Billionaires always seem to have strange quirks, whether it was Steve Jobs wearing the same outfit every day or Elon Musk's five-minute schedule. Anything to get that edge over the competition.
So it will come as no surprise to you that Jeff Bezos fits the bill here, too, with the Amazon founder pushing his body to the limits in the name of success.
Anne Hiatt was the CEO's executive assistant from 2002 to 2005, tasked with keeping his professional life in order.
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Based at the site of a former US Marine hospital at the time, with Amazon's office on the 14th floor, Hiatt remembers that Bezos would refuse to take the lift.
Instead, she says, he would insist on running up and down the steps, and never broke a sweat.
Hiatt said in an interview: "He's like a puppy. He would do laps and he was never tired.
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"That's Jeff. He couldn't be held back."
But Bezos' time as the head of Amazon officially came to an end yesterday (5 July).
The tech billionaire wanted to make it his last day as chief for a special reason: that's the same day when Bezos launched Amazon as an online bookstore back in 1994.
Twenty-seven years later, it's now an absolute juggernaut of consumerism, with millions using it every day to buy virtually anything.
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He will now retire with a wealth valued at around $197 billion (which is about double the wealth attached to the British Royal family, who were roughly worth $88 billion as of 2017).
Insider reports Bezos' fortune is 739,489 times the median net worth of an American at the age of 65. He also has more money than the GDP of entire countries.
Andy Jassy, the current CEO of Amazon Web Services, will take over as boss of the whole company now that Bezos is gone.
Jeff explained earlier this year that he wanted to step down from the top role to let him explore his other life passions.
In a letter to employees, Bezos said: "In the Exec Chair role, I intend to focus my energies and attention on new products and early initiatives. Andy is well known inside the company and has been at Amazon almost as long as I have. He will be an outstanding leader, and he has my full confidence."
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He acknowledged that a lot has changed since the company first started compared to the massive entity it's known today.
"Today, we employ 1.3 million talented, dedicated people, serve hundreds of millions of customers and businesses, and are widely recognized as one of the most successful companies in the world," he said in his letter.
Bezos said he was 'excited' about this new direction in his life and hopes he's able to commit more energy into the things that interest him.
"I've never had more energy, and this isn't about retiring. I'm super passionate about the impact I think these organizations can have," he added.
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