Vibrato: Torturous Exercises for the Double Bass

A demonstration of the Vibrato Exercise, from Dr. Morton's Torturous Exercises for the Double Bass.
PURPOSE: To gain perfect control of the vibrato so that you can easily and smoothly change between any combination of any vibrato speed and any vibrato amplitude.
Take it easy! As with playing anything, if at any time you experience pain in the hand or arm, STOP PLAYING IMMEDIATELY, rest awhile, and gently stretch out before resuming practice. Continuing to play with pain may cause damage to the tendons or muscles. (See the video "Hand Stretches for Musicians" by Dr. Morton.)