Just be athletic. You don't need to be jacked.
It is gonna help you if you're tall. But again not mandatory. This shit ain't Hollywood.
Now,....if you're black you gotta be packing otherwise you will not make it. Is not the same for white dudes, they only need to be above average.
On the contrary, it does not matter if you cannot get hard being black, all that matters is the cock to be big. And for whites, yeah, you gotta be functional down there.
If you're Asian, I'm sorry.
If you're Indian, I'm more sorry.

>used to assist a friend in the casting business (porn was not the main area tho, but we had requests....).