Here's Instructables co-founders Eric and Kristy testing out their $150 treadmill desk, which allows them to work and walk at the same time. Their incredibly cute baby seems to enjoy it.
This is related to my earlier post about Seth Roberts observation that doing two different boring things at the same time can be fun.
Mark Frauenfelder is the founder of Boing Boing and the editor-in-chief of MAKE and Cool Tools. Twitter: @frauenfelder. His new book is Maker Dad: Lunch Box Guitars, Antigravity Jars, and 22 Other Incredibly Cool Father-Daughter DIY Projects