Winging for 2 years and just about to turn 63. No issue with shoulders or arms for me, and I am certainly not a body builder type. These wings are so easy to ride with as much depower as you want. On the other hand I think fingers are definitely prone to injury when you start doing a lot of fast wing transitions where you have to let go and regrab quickly. I injured my middle finger when I missed a “regrab” during a “behind-the-back-tack”. I didn’t let go of the wing quickly enough after the miss, and it twisted quickly with my middle finger knuckle getting pulled pretty badly. They call it an avulsion.