Say the deadlift is forced some how.
The bench press, I imagine it would be hard to get the animal to want to bench the weight in the first place. But I imagined laying him on his back, with a ceiling coming down on him. 500LB of force, i have no doubt he would keep the ceiling from coming down on him.
What we all keep missing here is "power", while with greater strength you should create greater power, these animals have tremendous amounts of power, especially under adrenaline.
I have no doubt the animal would deadlift 2000LB untrained, and possibly over 800LB in one hand alone.
If the deadlifts have to be forced, it is possible by using a special "lifting straps" with hooks on them, similar to humans use.
The straps would have to of course be super heavy duty, possbly made out of kevlar and strapped so tight to the rists that the anmila has no choice but to lift that weight off the ground.
I have no doubt that while these animals strenght is amazing, their POWER is astonishing.
The same power that would allow a 500LB animal to cross a 20 ft chasm.
I saw the shoulder, neck and trap structure on that ape Casey. ANd then to top it off, they have so much more inherient POWER than the most trained human being.
This is definately interesting, and im now wanting to see two near 600LB roided up, trained angry gorillas going at it.