Can any of us mere mortals even begin to imagine the physical toll upon someone's body that comes from taking part in an event like the Tour de France.
And now I don't have to, because Polish cyclist Pawel Poljanski has shared a shocking image of what his legs look like after a gruelling 16 stages - or, to put it another way, around 2,829km - of cycling.
Check it out:
Is anyone else just screaming loads? It can't just be me.
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Alongside the photo, Pawel wrote: "After 16 stages I think my legs look a little tired," which is quite the fucking understatement.
Those sunburnt kneecaps on what looks like the Hulk's legs are too much, and I'm not the only one to think that. The photo went viral shortly after it was posted and has since been shared almost 13,000 times in 14 hours.
Credit: PA
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Pawel's legs have also attracted hundreds of comments, with some people freaking out over the post, some praising him for his commitment and dedication, others asking if he's tired (I think he probably is) and my personal favourite: "Looks like a human leaf wtf".
Pawe had no chance of winning the race, which makes it even crazier that he'd put himself that. What's more is the fact that were still another five stages to go until the rider could rest up and recover, utter madness.
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British cyclist Chris Froome won the race. Thankfully, he has never shared a photo of his legs, although most people would be more interested in seeing his medical records now.
It's enough to put you off getting on a bike ever again.
Featured Image Credit:Topics: injury, Tour de France, Cycling