I am a bit concerned about my arms. I spend the vast majority of my time with my arms bent (in order to use my phone - cos that's all I can do). I have recently heard about some people with very severe ME ending up with their arms permanently "contracted" (bent) due to them staying in that position without the muscles getting used. If I unbend my arms then they do straighten out, but not fully. I can try to exert my muscles to straighten them out, but it hurts and is tiring. Question is how much should I be concerned by this? Is there anything I should be doing about it?