I highly recommend a Saddle Stool for great posture and comfort while sewing. I bought one with my sit down longarm. After sitting in one at a show, I had to have it! It's the stool in front of my longarm in this picture:
[ATTACH=CONFIG]594265[/ATTACH]
Or see it here:
https://www.google.com/shopping/prod...3dBKYQkjAIAygB
All of the sewing machine dealers at the show were selling them!