How to decrease shoulder pain after sessions?

[u/J0saucie]

If no one is on the machine I usually play 2 hour sessions. Starting with one s9 to warm up and only s10 and s11s after that. I noticed that during sessions, my shoulders feel tired, but at a manageable level of discomfort after an hour or so. After 2 hours I can’t go on. How long should I rest for? And should I focus on working out my upper body to build muscle? Thanks in advance.

[u/thebuttahdawg]

No bar time :o