excercises?
 

what are some good excercises that isolate your forearms.

google it Mr. but i would say dumbells Bodybuilding.com - Forearm: Exercises, Anatomy And Tips!
there you go just go about half ways down the page and you will find plenty of exercises

In general. I think push-up is ok.

Try Dumbbel, Barbell exercises and cable wrist curl exercises. You can also try pull ups, shrugs and squats. All of these exercises help build and strengthen your forearm.