73-year-old billionaire Richard Branson's daily routine starts with an ice bath and a game of tennis

"Getting up and at it early gives me time to get on top of things, and chart my day effectively," he wrote in a 2014 blog post.

"The reason I like to wake up early, is so that I can work through my emails before most of the world logs on," he wrote in a 2017 blog post. "Living in the BVI [British Virgin Islands], I like to be online early, so that I am accessible and available to our offices in other timezones."

Ice baths have become popular in recent years, including among celebs and some tech execs in Silicon Valley, such as Twitter cofounder and Block CEO Jack Dorsey.

Branson goes to "play a hard game of singles tennis" around 6:15 a.m., he said in an interview with Australia's News.com.au in December.

Branson famously kite-surfed with a model, Denni Parkinson, naked on his back in 2009, for a photo op he later said was the idea of the photographer, who was dating Parkinson.

Branson also turned heads for kite-surfing with former president Barack Obama in 2017.

"To keep me energised, I drink lots of tea. I'm talking 20 cups a day – don't tell my doctor!" he wrote in his 2017 blog post.

His go-to is decaf English breakfast and he "has been feeling great since cutting out caffeine," Virgin told BI.

He usually eats "something high in fiber, like muesli and fruit, to fuel my day's adventures," he wrote in a separate blog post.

Branson bought Necker Island, in the British Virgin Islands, in the late 1970s for just $180,000.

During his walk, his assistant reads his emails to him. He'll also sit down with his assistant at other times throughout the day to "reply to anything else that comes in," he wrote in his 2017 blog post.

Between emails and calls, he catches up on the news, which sometimes prompts him to write blogs about various issues.

He'll spend about 20 or so minutes working out.

He often schedules meetings over lunch.

"I'm not a fan of formal meetings and would much prefer to lighten the mood with a shared meal, or if I'm pressed for time, a walking meeting," he wrote in his 2017 blog post.

He likes to go for two "extreme" bike rides a week, he told News.com.au, and also enjoys a good game of chess from time to time.

One of his recent bike rides got a bit too extreme, as Branson posted on Instagram that he "hit a pothole and crashed hard."

He views the dinners as a place "where stories are shared and ideas are born," he wrote in his 2017 blog post. Branson carries a notebook with him everywhere he goes to jot down such ideas as they occur to him.

Some of his preferred foods are — you guessed it — traditional British fare. He's a fan of egg sandwiches, stews, Shepherd's pie, and British roasts, according to a 2015 post on Virgin Group's website.

"I need around six hours sleep do it all again – a little differently – the next day," he wrote in his 2017 blog post.