Potentially playing Sousaphone... Advice?

[euphony]

I borrowed a sousaphone once. I'm awful at tuba honestly, but I didn't find the shoulder pain too overbearing. I personally find holding a marching baritone or marching euph much more painful than having a sousa rest on my shoulder. I'm not sure why that would be, but it was.

[iiipopes]

Two phrases for you:
Protect your shoulder
Technology is your friend

https://www.amazon.com/Neotech-51012.../dp/B007CXB3FE

[ATTACH=CONFIG]4633[/ATTACH]

Oh, how I wish I had that 40 years ago! Yes, getting the shoulders and back muscles into shape is a demanding chore, but well worth it to a player's overall health and stamina. I remember being sore as well for awhile until I built up strength and stamina. Maybe the coach or physical education teacher at school can give the OP some exercises to strengthen and balance the muscles involved.

There are also programs you can purchase, like The Breathing Gym by Sam Pilafian and Patrick Sheridan, that are essentially a tuba player's version of a workout video and course booklet.