Hacking a $200 Under Desk Exercise Bike
I've tried desk treadmills with a standing desk, bike desks which are designed for a laptop and under desk pedalers like this.  I end up ditching them all in the end because the movement is distracting enough to not let me get into the zone.  Whenever I need to focus on something I instinctually stop moving to 'free up' brain power to execute whatever I'm doing better, be it a computer game, writing or coding.Also you get more total workout by just going outside on a 30m walk, not to mention all the benefits of sunlight.  Now I just do walks and explicit exercising vs. the fence sitting that is a treadmill walking desk.