This is a video from a vocal coach, but I found this exercise really helpful for improving my posture on the the tuba too. Gave me some more breath capacity.

My tuba idol is definitely Carol Jantsch. I find her deft use of range and superb dexterity so impressive. She is such an accurate player. Truly a joy to listen to. Her performance of Frosty the Snowman and Variations is particularly impressive. Are there any other tuba players that y’all find interesting?