Have not seen any scientific backing for this Cornell recommendation 20m sit duration.
Most relevant study I have found is that sitting harm (average sedentary bout lenght & all cause mortality) actually begins at ~10-11m, and increases from that point. https://pubmed.ncbi.nlm.nih.gov/28892811/
"A marked increase in mortality risk was observed at ~10 min/bout; suggestive of a threshold effect."
Most relevant study I have found is that sitting harm (average sedentary bout lenght & all cause mortality) actually begins at ~10-11m, and increases from that point. https://pubmed.ncbi.nlm.nih.gov/28892811/
"A marked increase in mortality risk was observed at ~10 min/bout; suggestive of a threshold effect."