I actually sit like this most of the time when in a trade. And when out of the trade and waiting like this. Unless you grew up doing it, it can be hard, but it puts you in great shape.
Handy for trading the spazdaq https://elitetrader.com/et/threads/trading-chairs.226092/page-20#post-5374001
%% Shockingly old pattern=LOL. That maybe one of the best ones/ makes you stand up + not get in that chair. FREE, no charge comment.
%% IF a chair is too comfy\ to easy to go to sleep. NOT sure if that pic chair is to comfy . I had a LazyBoy gifted + glad to get rid of it=terrible name + too comfy. Names are important.
I would say that comfort is of the utmost importance and if you are comfortable sitting on a chair that is good for your back, go for it.