supersizeme raises a very solid point.
I've noticed that the more "plates" I put on the "bar" - it gets waaaay harder.
I've noticed that sometimes I'll sweat if I use too many of them.
also the more you do the harder it is.
so as far as I can see - you don't want to get winded since this is lifting and not aerobics.
so use a really light weight - just the bar is fine - don't be afraid of heavy weights (or midgets, or even light weights for that matter) - and then just do one rep.
and if you are doing squats, all you need to do is break the total vertical with you knees - if you bend too far, that also is hard - so just sort of bounce. people in my gym know to respect me b/c I'm quite big and I have a large presense and following.
also yelling and spitting makes you feel pumped up too.
then do lots of flexing in the mirror in downtime - but do it like the wrastlers on the tv do it - they are all about style - as should you be.