I sew in my barefeet so I keep moving my foot around. Years ago when I started quilting everyone had fixed their ironing board next to the machine so they didn't have to get up but just turn their chair. I finally had the space to do this and found out that this is no longer appropriate !!!
After I had my carpul tunnel repaired the doc pried out of me about how often and how long I sewed. ONE HALF HOUR then get up and move around. Also he told to move the machine or chair at least every 6 months. I have tried to follow his instructions but there have been times when I just had to sew just a little bit longer.