Definetly, so many pepople end up with tight abs and weak, inactive lower back muscles... really bad for the hips... same with chest and back work outs... most guys focus loads on getting their chest bigger, but not getting their back working properly... makes you look like quasimodo and puts your shoulders in an awful position.

Oh and ab roll outs kick my arse! I have long legs and relativly tight hamstrings... definetly something I need to improve upon.