I. ONE-FINGERED SCALES – Stay on one string using one finger (1, 2, 3,4 and even Thumb) Range can be 1 or 2 octaves, repeat the top note before descending. Ab, A, Bb, B scales major or minor on the G string are good choices. This is a great finger strengthener and vibrato exercise. Dr. Anna Jensen’s blog has great advice about curved fingers.
etc. You can also reverse the bowing.
Left Hand – Keep the curl in the finger being used. Stay on the fingertips, aiming for the little finger side of the tip. The tip of the thumb should be near the tip of the finger being used so that you see it making a circle with that finger. Keep all the fingers together at first for support, later use them independently to strengthen.
Right Hand – Let the bow slow down and sink toward the bridge. Use the back, flat hair, tip up , (smiley face) relaxed bow grip on the finger tips, keep the curl, feel the vibrations in your fingers – and all that good stuff.
Feet! – Keep them flat on the floor. The weight of the bow and the weight of the left arm are directed toward the feet. See if you can remove all unnecessary tension all the way to your feet so that the entire body is fluid.
As a VIBRATO exercise – Find your natural vibrato in relation to mm=60. It is usually 4 or 5 pulses per mm=60. Maintain this vibrato evenly through out the exercise using the metronome. You can explore other pulse tempos, up to 7 per mm=60.
B. Variation – Use combinations of 2nd, 3rd and 4th finger, in sequence.
C. Variation – “Planing” – repeat each note 2,4,8,16 times using bow planes. Bow stroke should be relaxed, short, topped bows, ON the string.
D. Variation – “Thumbing” – play a scale high on the D string. Keep the thumb riding on the G string.
E. Variation – chromatic – for arm rotation. Also, you can check the harmonic under-pinning for each note.