okay and the other exercises that are useless for me, well i dont' really do much i find useles... i like hack squats but i always feel like my feet are slipping out from under me, there's not a good grip on the pad on the one at my gym... just starting to get the hang of front squats (love 'em), not a big fan of dips, but i'm slowly getting the hang of them... sissy squats do nothing for me... don't know if thats me or the exercise... [/B][/QUOTE]
Phemomena
Why don't you try to use barbell hacks instead of the machine. They really work the quads, (especially the vmo) much better then the machine does.
As far as everyone talking about bent over rows, I use about 315 and have never had a low back issue. When I get heavier I tend to straighten a bit, but never go beyond 60 degrees.