The linked document shows physiological differences (circulation, etc.) with an erect posture, but makes no claims about the sitter being more "productive" or a

The linked document shows physiological differences (circulation, etc.) with an erect posture, but makes no claims about the sitter being more "productive" or any of the other claims this post makes. Perhaps the author can cite other sources rather than lazily suggesting "if you need more proof just google the 'effects of posture'."