My teacher taught me to vomit in Bb.
Its a 2 octave shifting excercise. Work on not speeding up the bow when shifting. Try to get a clean sound on the shift. You don't want to hear any glissando when shifting. You do this not by taking bow pressure off the string, but by slowing the bow during the shift.
Try sliding your finger up the string with a fast bow. You'll really hear the shift. Try it again with a slower bow, the shift won't be as noticeable. That's the purpose of this exercise.
Work on it slowly and stand up as tall as possible. 70 bpm with 2 clicks every note is a good speed.
Bb-C(Down bow), C-Bb(up bow)
Bb-D(down bow), D-Bb(up bow)
Bb-Eb(down bow), Eb-Bb(up bow)
...all the way up two octaves, then down again.
There are 16 finger combinations
1,1 1,2 1,3 1,4
2,2 2,1 2,3 2,4
3,3 3,1 3,2 3,4
4,4 4,1 4,2 4,3
I usually vomit 4 times a day.
All the way up and down on 1,1, All the way up and down on 1,2 etc. Then the next day it's 2,1 2,2 2,3 2,4..
People in the other thread we're saying this is a glissando exercise. I was taught to aim for as little glissando between the shifts as possible.