Two grown-ass men beat the hell out of each other for nearly two minutes during a wild brawl at a gym earlier this week ... and the insane fight was all captured on video.

The scrap went down at a Fitness Connection facility on Tuesday -- when an apparent disagreement in the weight room turned incredibly violent. Men’S T-Shirt

Footage shows a man in a white t-shirt and another guy in an all-red 'fit squared up -- and then traded blows ... all while astonished gymgoers looked on.

This why I don’t go to the gym at 5 PM pic.twitter.com/aZowAsHyMC

The two both socked each other in the face repeatedly ... before the man in the white shirt was staggered by a huge right hand. A woman then attempted to intervene -- but all that did was give the man in the white shirt a chance to get up and continue the melee.

The two eventually locked arms -- and threw knees at each other. Finally, however, after pummeling each other for around 100 seconds, the tilt was broken up.

No word on if police were called ... or if anyone suffered significant injuries.

A spokesperson for Fitness Connection tells TMZ Sports the org. is aware of the incident and "strongly condemns any acts of violence, especially within our facilities." It's unclear if the combatants will be booted from the gym permanently.

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