baji! yes I've seen that at my gym but I dont know how to use it, so I never bothered. I usually only do leg curls and these other leg machines one which works out the inner, and one that works out the outer thigh.
So you say the leg press would be most effective? I think Im gonna go and try that one tehn.
Riya it may increase the size of particular area you spoke about.
Would you be ok if they are more defined but say an inch larger? Like athletes?
And what ever exercise you pick do more raps. Less weight more raps.
And try dropping leg curls/extensions.
In theory runnig should solve the issue for you. I mean with out doing leg workout.