When you are sitting in a chair, the top of your MACHINE,(not your table) should be level with your arms bent at a 90 degree angle..you either need to set your machine down into your table, or lower your table to accomplish this, but it will make a world of difference...also...the rule of thumb is that for every decade of age you reach over 40, you will need 20% more light on your work...if you can't see well enough, it will cause you to hunch forward toward your work no matter what height the machine is! Also..remember to get up and walk around every so often...when you have to stop to change thread colors or a bobbin is always a good time because you have stopped anyway...so get up and stretch and bend and walk around a bit...it all helps.