If anybody can overcome his injuries to return to the PGA Tour, it is Tiger Woods, as nobody is more competitive –here’s five examples to prove it.

He used to have a crazy, non-stop daily routine

Woods often practised before and after competitive rounds; he was even spotted playing in the dark at the 2011 PGA Championship.

Woods recently revealed to Justin Thomas what his daily routine was when he was younger: “I used to get up in the morning, run four miles (6.5km). Then I’d go to the gym, do my lift. Then I’d hit balls for two to three hours, I’d go play, come back, work on my short game, I’d go run another four more miles, and then if anyone wanted to play basketball or tennis, I would go play basketball or tennis. That was a daily routine. I’m not doing any of that now.”

According to his former trainer, Hank Haney, Tiger’s marathon training days would last for 13 hours. In fact, he was obsessed with working out that he even did it in the middle of the night. Golfer Rory McIlroy said he used to receive texts from Tiger at 4am saying he couldn’t sleep, so he would go lift.

Woods’ former coach claims that he injured himself doing insane, Olympic-style weightlifting exercises to get stronger.

He even played with a broken leg and torn ACL at the 2008 US Open … and won. Before the 2019 PGA Championship, Woods was asked about golfer John Daly getting permission to use a cart. Woods grinned and referred back to that US Open win, saying, “as far as J.D. taking a cart, well, I walked with a broken leg”.

He has plenty of rivals

Woods was not known to be very friendly on the golf course during his prime, making plenty of rivals throughout his career. He once fired an iconic death stare at his ex-caddie Steve Williams after their messy break-up.

Phil Mickelson has been one of Woods’ top rivals, though it appears the two are now friendlier than ever. When Woods and Mickelson played a practice round together before the 2018 Masters, it was so surreal that McIlroy actually told Woods, “I never thought I’d see the day: Tiger and Phil playing a practice round at Augusta”. Of course, Woods still had to have some fun afterward, commenting Mickelson’s button-down golf shirt was missing a tie.

But though he has rivalries, he also sends tough love. He once gave McIlroy some odd motivation before a tournament. According to golf writer Jason Sobel, McIlroy recounted, “He told me to get my finger out of my a** and win this week.”

Tiger hates losing – in all sports

Woods’ caddie Joe LaCava said on the Inside the Ropes podcast that he once beat Woods nine times in a row at the basketball shooting game horse, and Woods wouldn’t talk to him the rest of the day.

Woods’ refusal to give an edge in any competition apparently extends to table tennis too. On The Masters’ YouTube channel in 2018, retired pro golfer Jack Nicklaus told a story about watching Woods and Mickelson play. When Mickelson won a round after switching sides, Woods refused to keep playing.

He said: “Phil says, ‘Hey Tiger, how about a game of ping pong?’ … So Tiger plays, and Tiger wins the first game. They play another one, Tiger wins the second game. Phil says, ‘I’ve got this buffet behind me, let’s switch ends.’ They switch ends, Phil wins. Phil say, s ‘OK, come on Tiger, let’s play one more.’ Tiger says, ‘Phil, two to one.’ And he never played him again the rest of the week.”

He doesn’t take it easy on anyone, including his ex-girlfriend Lindsey Vonn. She told USA Today he won every time they played ping pong or tennis.

Pro golfer Maverick McNealy also told Golf.com a story about Woods accepting a challenge to hit a building in a canyon with a golf ball. He did it in two tries, then did it again.

“Tiger hits one. And he’s like, ‘Oh, it’s about 10 yards (9 metres) right.’ My dad said, ‘Yeah, 50 yards short of anything.’ And he had a little house, a little roof, way down there [in the canyon]. And Tiger was like, ‘Give me another ball.’ So he gets another ball, tees it up, hits it and says, ‘That’s right on it.’

“And it’s a dead quiet, dead still evening. And the ball’s going, going, going. Then I hear, bam! Right off the roof. And so we all run inside, giggling and laughing. The roof had to have been 400 yards out there and 50 feet, maybe more, dropped down into a canyon valley. And Tiger says, ‘Oh, I’m going to do that again.’ So he gets out, puts another ball down, rips it. And bam! Rips it off the roof again. We said, ‘OK, we’re done. We’re done.’”

He’s a perfectionist on the course

He changed his swing in 2002 after winning eight majors ... because it wasn’t “perfect enough”. He has since changed his swing several times, leading to some criticism from those in the golf world.

In 2000, he took a gamble and switched to a solid-core ball that no one else was using. Two years later, the entire tour was using it. In the 12 months after he changed balls, he won nine tournaments and all four majors.

Robert Lusetich at Fox Sports said, “Once, at the Masters, when Mickelson watched his Woods hit a three-wood past his driver, he asked Woods if he always hit fairway woods so far. ‘No,’ said Woods, pulling his tee from the ground before marching down the fairway. ‘Sometimes further.’”

He’s made numerous comebacks from injuries

Upon returning to golf in 2015 after an injury, Woods said to Ealing Times: “Competing is still the same. I’m trying to beat everybody out there. That hasn’t changed. I prepare to win and expect to go and do that … The only difference is that I won the Masters when Jordan [Spieth] was still in diapers.”

At the 2019 Masters, where Woods won his 15th major and proved he was finally back, he reportedly cursed himself out in a bathroom in private after two straight bogeys. He then rebounded to win the green jacket.

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This article originally appeared on Business Insider.