Hi Csaba,
There hasn't been any exercises I haven't been able to do with the Selecttech weights. The only one that is slightly awkward is the cross body tricep extension because of the size of the weight. When Cathe uses a barbell for bicep curls etc I just just the Selecttech weights. I have the bowflex version and they go up to 40kg which I'm guessing is about 88pounds. Message me anytime if you want to know more.
Susan