Cook typically wakes up brutally early.

Tim Cook wave coffee
Drew Angerer / Getty Images

Source: USA Today

According to USA Today, he usually rises at 3:45 a.m.

Tim Cook
Getty

Source: USA Today

Once he's up, he gets to work reading through some of the 700 to 800 emails he gets every day.

Tim Cook Sia phone
Stephen Lam / Stringer / Getty Images

Source: Business Insider, Business Insider

He once told ABC that he's "a bit of a workaholic" who reads "the majority of those" messages.

Tim Cook
Apple CEO Tim Cook.
Drew Angerer/Getty Images

Source: Business Insider, Business Insider

Next, Cook hits the gym around 5 a.m. The CEO doesn't work out on Apple's campus, however. He prefers the privacy of an outside gym.

Tim Cook apple watch
Stephen Lam / Stringer / Getty Images

Source: Business Insider, Mashable

The Apple CEO is mum about most of his hobbies, but it's reported that he takes fitness seriously.

Tim Cook
Justin Sullivan / Getty Images

Source: Pakwired

He's credited his Apple Watch with helping him keep in shape and even lose weight.

apple watch tim cook
Apple CEO Tim Cook and model Christy Turlington at the Apple Watch launch event.
REUTERS/Robert Galbraith

Source: Pakwired

It's not clear whether or not Cook enjoys a regular breakfast, but he dug into scrambled egg whites, sugar-free cereal, and unsweetened almond milk during a sit down with New York Times reporter Andrew Ross Sorkin.

Tim Cook
Stephen Lam / Stringer / Getty Images

Source: The New York Times

He also ate bacon, but prefers turkey bacon, apparently.

Bacon
Shutterstock

Source: The New York Times

When it comes to his work, Cook is reportedly collaborative and a good listener, according to TIME.

Tim Cook
Kevork Djansezian / Getty Images

Source: TIME

Cook also has a reputation as a demanding boss. Business Insider reported that the CEO is known for his "no-mercy" style.

Tim Cook Apple employees
Handout / Getty Images

Source: Business Insider

He reportedly hosts marathon meetings, questions everything, and emails employees "at all hours."

Tim Cook
Apple CEO Tim Cook.
Mike Blake/Reuters

Source: Business Insider

That doesn't stop Cook from occasionally grabbing lunch with random Apple workers in the company's cafeteria, though.

Tim Cook Apple
Justin Sullivan / Getty Images

Source: Mashable

In addition to being at work early, Cook has previously said he's one of the last ones to leave the office, too.

Tim Cook
Justin Sullivan / Getty Images

Source: Inc

When it comes to what he does outside of the office, the "intensely private" Cook prefers to keep things quiet, according to Fortune.

Tim Cook
Justin Sullivan / Getty Images

Source: Fortune

It is known that he enjoys spending time outdoors, often hiking and riding his bicycle in his free time.

Tim Cook
Drew Angerer / Getty Images

Source: TIME

It's reported that Cook likes to catch seven hours of shut eye a night, meaning that he has to turn in by 8:45 p.m. to get enough rest before his early wake-up.

Tim Cook
Stephen Lam / Stringer / Getty Images

Source: The Huffington Post