Ask HN: Any one has experience with a pedal desk?

Hi, currently I am working on a static standing desk a few hours a day and I find that my concentration is better when I stand. Atleast I am more aware of the passage of time :) . The main motivation for adopting a standing desk is health. Unfortunately, shifting from standing to sitting or vice-versa requires some cognitive effort and change of desk arrangements , and standing is uncomfortable immediately following lunch or breakfast. I am wondering if an under desk pedal would give me the same benefits while not having to change my sitting desk layout. Has anyone used an under desk pedal? How did it workout for you? How does it fare compared to a standing desk?