I worked on an assembly line back in 2010 or 2011. The same repetitive motion for 8 hours every day. I did this for about two weeks. Then one day I thought I had somehow broken my arm because between the wrist and elbow it hurt so bad. I told the boss I needed to go see a doctor. I went and he said it was tendinitis. I went back to work and quit. Screw that mess.