I leave the top drawer of my desk open all the time with a small pillow setting on it so I can rest my right arm when using the mouse. Works much better than chair armrests.
That would be a killer for my back. I ride bike 15-20 miles per day. That's enough saddle sitting for me.
Try cushiony stools that may have a backrest as well...You want to avoid 90 degree knee/hip flexion all day long.....
All crap. I tried it all. Ball, stool, all sorts of ergonomic chairs. Standing desk that cost thousands. All bullshit. None of that stuff worked, either standing made me tired after half an hour or having no proper back rest support actually felt worse than sitting on a proper chair. Then the constant moving around is completely inefficient for work. I now have one of the most expensive height adjustable desks do nothing other than being a static desk. Back to the roots, nothing beats a proper chair and my HermanMiller is still going strong after 15 years. That entire industry is infested by marketing bullshit. Here is the simple solution. Sit in a proper chair at a proper desk and get proper work done. Stand up once an hour or so and get some water or walk a round. Rinse and repeat. When it's time for exercise then exercise properly. This merging of all daily activities and in the end not doing anything properly at all is very unproductive. Where are all the super healthy guys and gals that live such a happier life on their balls and stools and special standing arrangements? I don't see them anywhere.
I have found gamers chairs the most comfortable. I am at my desk a lot and it is well suited for that. Curious about that Ergo chair but my cat would rip that mesh to shreds.
I always liked JPs office on the movie Grandmas boy, chair reclined about 45 degrees, screens also at 45 degree angle. I could sit like that all day