yes its true, that to have large quads you have to squat big! But is is the same for chest? I heard that is possible to chisel out huge pecs by just doing iso-concentric movements...i.e) press ups...upright dumbell rows and last but not least cable crossovers. These exercises and more can contribute to your chest workout aswell as your more modern day exercises ie) decline dumbell presses, incline barbell press..etc... So if youve reached a plateau in your chest workouts, then try some of these iso-concentric exercises....they may work for you!