Björnsson - aka The Mountain from Game of Thrones - is now less mountainous than he used to be, but no less fearsome.
The former World's Strongest Man winner has shifted his focus from bulking up to trimming down, as he tries his hand at boxing.
He revealed his remarkable transformation in a post on Instagram:
In order to shed the weight, the 6ft 9in behemoth had to cut down on his calorie intake, which used to be pretty ridiculous, quite frankly. Check it out for yourself:
6.50am - morning workout (cardio & core) glutamine and a handful of almonds
7.30am - eight eggs, avocado, 200g oats with blueberries and strawberries
9.30am - 400g beef, 400g sweet potato, handful of spinach and greens
11.50am - BCAA and Glutamine
12.00pm - 400g chicken, 400g potatoes, greens and fruit
2.00pm - blender of 150g oats, two bananas, 150g cereal, frozen berries, handful of almonds, peanut butters and glutamine
2.30pm - strongman training - BCAA, glutamine and vitargo
5.30pm - 60g protein, two bananas
6.00pm - 500g beef, potatoes and greens
8.30pm - 500g salmon, 550g sweet potatoes
10.30pm - six eggs, avocado, 30g almonds, 50g peanut butter
Now, he's still devouring a f*** tonne by normal human standards, but it's significantly less by human mountain standards. Observe:
Brekkie - three eggs, 200g chicken, smoothie
Sparring and footwork training
200g tenderloin beef, 180g white rice, 100g greens
Weight lifting upper body
220g chicken, 250g potatoes, 100g greens
100g greens, 100g rice, 220g salmon
250g Greek yoghurt, 30g almond butter, 100g bananas
So, it's clear to see then how he's shifted so many pounds. Indeed, to him, it feels like he's eating 'nothing' nowadays.
In a YouTube video, he said: "This is what I eat throughout the day, guys. Can you believe it? I'm eating nothing. Getting skinny, it's crazy huh?
"I'm enjoying it, I feel so much better, so much better.
"When I was 205kg, I was force-feeding myself, every single day about to puke, every single day. But I kept eating 'cause my goal was to be the strongest human on this Earth.
"Now I have different goals so I don't have to be force-feeding myself."
We'll see if it's all paid off when he fights Simon Vallily on 28 May.