to quickly answer your question, yes, basically... but, if you don't do much sprint work or high intensity cardio, you *may* have weak hams... most people's hammies are greatly unbalanced with their quads, with you I'd reckon this is probably not the case since you said you switched from a workout using the basic flexion/extension movements... only reason I do extensions, is to warm the bitches up FOR squats/presses, and get the knees rollin' ... and will occasionally throw in a few sets of curls at the last... easier to completely finish off the hams, and make sure they don't lag behind.