Picture of Your fiddle - left hand exercises 2
You need to build up the muscles you need to push down the strings. Keep a clothes-peg in your pocket, and in idle moments do this exercise. Do everything as slowly as you can manage to educate brain and muscles. If it hurts, stop and try again the next day.

Step 1: First finger

Picture of First finger
Take the open ends of the clothes-peg between the TIPS of left hand finger and thumb. Without any help from the other fingers, slowly close the clothes-peg together. Now allow it to open again - as slowly as you can. Repeat 5-10 times.
I can see how steps 1 & 2 could help improve one's playing, but how is step 3 beneficial?
Also, I assume that these exorcises  would benefit any string player? I myself play the cello, not the violin.
LDW (author)  a.nony.mouse5 years ago
It's just a question of building up the muscles of the left hand. The trick is to develop independent movement of the left hand fingers so that you can move one without moving all the others.

Yes - it should help for cello (or any other sting instrument) as well.

NB: These exercises are things you can do when you're not at the instrument. Obviously, they are not a substitute for playing!