Topmusicanswers
Musculoskeletal injuries of the forearm, wrist, and hand are a significant problem for pianists. ... Results confirmed that muscle fatigue is detectable in the forearm muscles used for piano playing and that there are differences in the development of muscle fatigue between pianists and non-pianists.
Why do my arms get tired when I play piano?
Probably something to do with the tendons. Try altering your posture. I've found that when I sit with a very rigid back I get more strain faster than when I am relaxed. Moving with the music and focusing on loosening up the muscles in your arm might help.
Do pianists have strong forearms?
Do pianists have strong forearms? In short, no. Many pianists don't have strong forearms. Although playing the piano involves your forearm muscles, it is not a vigorous activity enough to make the forearm strong.
