I recently got one of those Varigrip hand excercisers that you often see in music stores. I always thought they were ridiculous until I tried one.
I work out regularly , I've been playing bass for over 40 years and I have pretty strong hands. These Varigrip things allow you to work each finger individually. Any other hand excerciser I've ever seen works your entire hand as one group of muscles. When you work your pinky individually, you will be amazed at how weak and uncoordinated it is
Almost every stringed instrument player tends to use their ring finger to support the pinky most of the time . Strenghtening your pinky will provide you with greater dexterity and you will use it more.
Playing scales for hours on end is a good thing for strength and dexterity but it is nothing compared to isolating that little finger and working it out on it's own
.
Take your little girly man pinky and pump it up
Rick