Wladimir Klitschko packs a mighty punch.

The 6′6″, 246-lb Ukrainian boxer and former world heavyweight champion is a muscular beast with over 50 knockouts in his career.

Klitschko tried pull off another one when he took on British boxer and heavyweight champion Anthony Joshua in their title fight at Wembley Stadium in April 2017, but he lost on a knockout.

Now, after a long and successful career, Klitschko has decided to hang up his gloves. There was some expectation that Klitschko would fight Joshua in a rematch, but the fighter has opted to step away.

"I have achieved everything I dreamed of, and now I want to start my second career after sports," said Klitschko, according to the BBC.

Klitschko battled incredibly hard—he even knocked Joshua to the mat in the sixth round—but it wasn't enough to win. Klitschko did all he could for 11 rounds and had plenty of respect for Joshua after the fight too (even after he got hit by a wicked uppercut.)

Klitschko is a goliath in the sport, and just like Joshua—as well as celebrities like Dwayne “The Rock” Johnson, Jean-Claude Van Damme, Arnold Schwarzenegger, Dolph Lundgren, and Aquaman badass Jason Momoa—the boxer likes to share his workouts on social media.

Here’s a look at Klitschko’s 11 most badass workout moments on Instagram:

11. Klitschko gets in a sparring session:

 

Kudos to my sparring partners who keep challenging me in all these weeks of work. #obsessed #JoshuaKlitschko

A post shared by Wladimir Klitschko (@klitschko_official) on

 

10. Klitschko works on his form with some punches while holding dumbbells:

 

I know the consequences if I don’t take up this challenge. I take it up and I will win. #obsessed #JoshuaKlitschko

A post shared by Wladimir Klitschko (@klitschko_official) on

 

9. Klitschko gets things going on the speed bag:

 

I‘ve got one goal and I will reach it. #obsessed #JoshuaKlitschko

A post shared by Wladimir Klitschko (@klitschko_official) on

 

8. Klitschko shows off his massive and muscular upper body as he does pushups:

 

7. Klitschko works up a sweat with some punching and cardio:

 

I keep pushing forward and can't wait to get back in the ring with Fury #nowmorethanever

A post shared by Wladimir Klitschko (@klitschko_official) on

 

6. Even in the office, Klitschko gets things going with some jump rope:

 

No matter how many office hours logged, no matter where my appointments are, I always work out. #ImTheMovingForce

A post shared by Wladimir Klitschko (@klitschko_official) on

 

5. Klitschko builds muscle with some squats:

 

Who needs an offseason? There is always a reason to do your squats. #klitschko

A post shared by Wladimir Klitschko (@klitschko_official) on

 

4. Klitschko grinds out pushups:

 

I keep pushing forward and can't wait to get back in the ring with Fury #nowmorethanever

A post shared by Wladimir Klitschko (@klitschko_official) on

 

3. Klitschko gets elevated for this workout:

 

2. Klitschko goes fists-down for these pushups:

 

It’s all about the basics. Lots of punches mean even more pushups. How many can you do in one set? 📷 by @neonostalgia

A post shared by Wladimir Klitschko (@klitschko_official) on

 

1. Klitschko shows off his massive biceps as he gets in some rotational work: