Question about Topstar Sitness 20

In the end, it's up to you how you sit. But the lack of a backrest means you automatically adopt a better posture. It may be a little more strenuous in the first few days, but then your back will thank you.

It doesn't force you to stand up straight, but it's very pleasant.

Hm, generally speaking, if you don't take care of it, nothing will make you sit up straight. But this armchair provides the best conditions, and I won't be giving it away again!