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.
Time Saving Technique Practice Idea
15 Reasons Why Practicing Technique Can Improve Your Time at the Piano
Why We Should Practice Scales, Chords and Arpeggios
A few of my students detest their technical exercises. In fact, I have a few students who really need to pull up their socks in this area if they're going to pass their piano exam next month. I hated them too. With a passion. That hatred was reflected in my poor technical skills mark on piano exams.
Since then, I've learned to like them.