I play piano, guitar violin and other instruments.
I have a little weakness in my ring finger, especially the left one.
Instrumently-agnostic speaking, to reproduce what I'm talking, place your left hand on the table as if you were holding a tennis ball in it. Raise each finger individually. How high are you able to lift your ring finger?
I'm able to life all my fingers high (all the fingers go up, third finger straight), but the ring finger wont go any higher than 1 inch (I have long fingers). And this disturbs my playing, and I'm sure if I take care of this, my playing will definitely improve.