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The European super-lightweight champ has still been training hard while in lockdown and decided to share a live-stream of his routine with his fans on social media.
It all started off well enough, with Maxwell hitting the punchbag, until he attempted to put in an uppercut and things quickly went pear-shaped.
He dropped to his knees and told his pal to stop filming before the camera cut out.
He later showed off the injury he had caused himself with the punch, as his mate unhelpfully rubs it in by saying: "It's looking bad, you know." It sure is.
But it seems as though Maxwell saw the funny side as he later shared the clip on Twitter, with caption: "My Instagram Live workouts are cancelled until further notice." Probably for the best, mate.
To insult to his injury, the clip has now been viewed thousands of times and has racked up more 'crying laughing emojis' than you can shake a stick at.
However, Maxwell shouldn't feel too down about the whole thing, because he's not the first pro-boxer to land one on himself.
World Heavyweight Champion Tyson Fury managed to punch himself in the face while in the ring and quickly became one of the greatest gifs of all time.
Fury, who was just 20 at the time, was in a bout with Lee Swaby in 2009. As Swaby backed up onto the ropes Fury launched an uppercut which somehow completely missed its intended target and came back to hit him right between the eyes.
He didn't let it slow him down, though, and the fight was stopped in the fourth round with Swaby unable to continue.
Fury also saw the funny side of the whole thing, as he later told BT Sport: "Reason behind it was, I was in a fight and I couldn't really feel the other guy's punches.
"So I decided to punch my own self in the face."
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