Slouching is caused by the design of chairs and soreness in a single sitting position. I have a love-hate relationship with my Salli chair, but angle your legs

Slouching is caused by the design of chairs and soreness in a single sitting position. I have a love-hate relationship with my Salli chair, but angle your legs down and slouching is no longer an issue, to the point where you don't even need a back on your chair.