The source of tone... the bow hold
Between the violin and the bow... the violin gets most of the attention; however, it's the bow that makes the violin sing. Yet, the bow doesn't move on its own. It's held by fingers, which are connected to the hand, which is connected to the forarm, the upper arm, shoulder, shoulder blade... and finally the connection ends at the spine. And the spine is our direct connection to the brain. Phew! That was a long journey. But still, this long arm connects to the bow through the bow hold.
There are instances in which we feel that all the planets and stars align, every muscle, tendon, neuron are working in harmony. This is what we want to recreate every time that we use our bow on our instrument. How do we do this? I like to begin with a bunny. Yeaup, a bunny. The second and third fingers are the bunny teeth, the first and fourth are the bunny ears and the bent thumb is the chin. It's very important for the teeth and chin to be strong in order to munch on the carrot. However firm the bow hold that does not paralyze the joints (wrist, elbow, shoulder). I like to have my students draw two feet tall letters while holding their bunny bow hold to make sure that those joints are nimble.