[dnsco]

My understanding is that any position for too long becomes un-ergonomic, and really our bodies crave variability. I do my most productive coding on my couch in a weird slouching position, but I try not to do it for too long. I'll frequently switch back to my desk, and then try and take as many calls as possibly walking around the neighborhood. I can't focus on code at a standing desk or sitting on a yoga ball or whatever other people prescribe, but if you can throw that into your mix go for it, but sitting on a yoga ball all day is probably as deleterious as doing anything else all day.

There are definitely different ways to use your body with different effects, but I think the problem is over use of any specific form.

[fouric]

I appreciate your attempt to help, but what works for your body may not work for others - I'm looking for general ergonomic principles backed up by sound scientific evidence.

[saulpw]

I can't provide you with the scientific basic for correct elbow angles and back erectitude, but I will echo the GP's meta-suggestion of 'variety'. I've heard you're supposed to change position every 20 minutes, and stay no more than 2 hours in any position. Walk around, swing your arms. This is the first-order bit. Most other techniques and tools seem to be band-aids to help you tolerate longer stretches of time in a single position. Which, do what you gotta do. But changing it up is the most important thing.

[radlad]

Have you started here? https://scholar.google.com/scholar?q=anatomy+ergonomics