Just months after Ben Askren was hospitalized with a severe staph infection that led to life-threatening pneumonia and ultimately a double lung transplant ... the former UFC star is back doing what he loves, posting a video of himself hitting the wrestling mats!

Askren shared the video to his social media on Thursday, showing him lacing up a fresh pair of wrestling shoes and getting some training in. Getty

"4 months ago I was on my deathbed," Askren wrote. "3 months ago I couldn't stand unassisted, 2 months ago I was still using a walker."

"What's your excuse?? Tie them up tight and let's get to work!"

The comment section was flooded with people who couldn't believe what the former Bellator and ONE welterweight champion was doing ... including his good friend Daniel Cormier , wh

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