I recently listened to the Contrabass Conversations interview with Max Dimoff. I've been using Mr. Dimoff's warm-up exercises for a long time. I like them for the purpose of working on my intonation. I also do the exercises (when I have the time) using pizzicato in order to focus on getting a strong pizz sound.
In the interview, Mr. Dimoff is quite detailed aobut the role of the warm-ups and what he thinks about while going through the exercises. While I worry about intonation, he's considering getting a good sound, how he's carrying his weight, and other more fundamentals on the bass. Great interview.