Many people find that when they are playing an instrument, their ring finger tends to feel the weakest. Why is that? It is the way the tendons connect. Those last three fingers are actually connected. That is why exercises to strengthen and create independent fingers make playing easier. Try placing your hand on a table or holding a pencil. Then tap each finger with small taps on the surface to work on independently moving each individual finger and allowing the muscles to take over. Do this a couple minutes a day and you will see greater improvement, especially in the weakest finger, the ring finger.