Dr. Morton's Torturous Exercises is a collection of thirty extremely demanding "calisthenics" for bass. These exercises were collected from teachers, adapted from other instruments, or newly created over a period of twelve years. They are not études. They make no attempt to make melodies or music.
Because students have limited practice time, progress as quickly as possible by gleaning the most benefit from the precious time available. As a result, this is a compilation of exercises where each one focuses on a particular technical challenge, distilling it down to its essence.
The purpose of each exercise is stated clearly so that the a player will know what skill he or she can expect to acquire. These 32 pages include two or three exercises each for tone, vibrato, left hand velocity, shifting, on-the-string bow strokes, off-the-string bow strokes, staccato, string crossing, and miscellaneous exercises.