Unless it's a cab driver, you are not beating a pro who does this for a living. Of course size will matter as a heavyweight shouldn't be fighting Roman Gonzalez but I reckon he could **** a few people up. For example, on pros vs joes back on the day, a big guy (200lbs+) with some boxing experience still got messed up and stopped in Round 1 by Gatti RIP.
Pro boxer beating up a fan - http://********/PZeByaS87_Y
Shaq o Neal vs ODLH - http://********/BG4jg14nUK8
Pro boxer beating up a fan - http://********/PZeByaS87_Y
Shaq o Neal vs ODLH - http://********/BG4jg14nUK8
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