Some big men there. And pretty much all muscle, I'd imagine.
Maybe not as huge as some AF tackles, but here's some rugby league highlights...
http://www.youtube.com/watch?v=3mY-ndD5LLI
...and some rugby union highlights....
http://www.youtube.com/watch?v=tc0Ut5y-GRc
Not a lot of padding for these guys.
James.