This is my fave piano warm-up these days: arpeggios.
My friend and colleague, LaDona Ahenda expands upon my list of Popular Hand & Technical Exercises Books with this three-part series.
If you or your piano teacher have decided that you add finger strengthening exercises into your at-home practice sessions, check out these popular books of finger exercises. Please note, this list is just for piano. I'll eventually get around to posting popular exercise books for the other instruments.