I'm about 6 foot tall. For a comfortable seating experience I recommend the 55cm ball, inflated to be quite firm; or the 65cm ball, left kinda squooshy.
They key being to have your knees bent at around 90 degrees when sitting upright.
That is all. For now.
Oh and I am back in Tokyo as of 16hrs ago. Very interesting neighbor, and new friend, on the flight. Happy as hell to be back here. It felt very much as a homecoming. Oddly.
