Reclining is Good for You

Personally, I tend to feel more comfortable leaning backwards in a chair, even if I sometimes worry that it suggests that I'm rather too relaxed and not paying enough attention (in a tutorial, for example). The good news is that it looks like I can now justify my preference on the grounds that it has been shown to be a better posture for your back (which is, I guess, why I feel more comfortable that way in the first place...).