In my early 20's I started working at an office job. About 6 months into the job I started getting this terrible pain in my shoulder. Being in my 20's, it was

In my early 20's I started working at an office job. About 6 months into the job I started getting this terrible pain in my shoulder. Being in my 20's, it was surprising to get this kind of pain for no reason so I started to try and figure out why this was happening. I found the answer this way: - I realized that when I was typing, I was leaning heavily on my elbow - Leaning on my elbow meant that my shoulder was being stressed as it was carrying a lot of my seated weight - But why was I leaning? I figured maybe my desk wasn't level and I was compensating by leaning on my elbow - I brought in a level and measuring tape and realized one side of my desk was 1.5" higher than the other. The building I worked in was over 200 years old and I realized with some more measuring and level checking that the whole floor was "wavy". In fact, if I spun in an office chair instead of feeling like I was rotating around the axle, my head transcribed a circle due to the floor being slanted. Moral of the story: it made me a believer that very small things (desk out of level, mouse pad a little too far, keyboard too close etc) can have surprisingly large effects physiologically.