No shit. If I do nothing but squats, and you do nothing but bicep curls, my legs will be bigger than your legs, and your biceps will be bigger than mine. DUH.
Individual muscles cannot be shaped. Your body can, but not individual muscles.
I guess I misunderstood your meaning.
I hope you know that ISO movements won't shape a muscle. Muscles only get bigger. PERIOD (except quads). Different exercises can stimulate a muscle in different ways, causing it to grow and adapt to the new stimulus. But you won't grow your upper chest without growing your lower chest. You won't grow the different heads of your bicep individually.
Different grips are used to stimulate individual muscles more or less, not different PARTS of the muscle differently. ISO movements should be used to give a certain muscle more training stimulus, thus causing it to grow, or get stronger.
Go try and make the top of your bicep bigger, or your upper chest bigger. Good luck. The whole thing has to grow, you can't make a certain part of a muscle grow. Try and flex
only one head of your bicep, or only the top of your chest. It cannot happen. When you place a load on a muscle, your brain only knows how to fire the whole thing (or all it knows how to fire) in order to lift the load.
Maybe what you're trying to say is that you want to bring up lagging body parts? Would that be a better way of explaining what you're trying to do? In which case I would just hit those body parts more during your cycle, whatever it may be. Don't count on the shape changing (
size) if you aren’t gaining, however.
A quick Google search on the subject:
Site1Site2And this concludes our lesson for today. Take this as a hint that you don't know enough about training, and maybe should study the subject a little more before going forward. You can hurt yourself by doing things incorrectly.
I don't think anyone ever knows all there is to know about training. This is why I read CONSTANTLY.
Good luck