This is specifically what I was thinking about. Try commuting via public transit for 100% of your daily needs and keep a tally of how much time you spend sittin

This is specifically what I was thinking about. Try commuting via public transit for 100% of your daily needs and keep a tally of how much time you spend sitting at stations or stops waiting for connections. Obviously the city and infrastructure would cause this to vary, but my experience using public bus transit anywhere in the US would be a good hour less (at minimum) of jog-possible leisure time every day. And that's if you live in a relatively convenient transit location (typically not cheap). You may be able to read a book at a stop, but you aren't jogging / spinning / doing yoga.