Sword-fighting martial arts practice dummy that fights back!
Boy's been doing kendo for about a year now and I saw a photo of a kendo practice dummy and thought we could knock up something similar in an afternoon with just the bits we had lying around. And it works! Articulated in three places! Fights back!!! (This is for an eight year old, but you could adjust the height and happily build a bigger one for an adult. Happy to answer any questions about it.)
Full instructions here: http://baddadgreatkid.blogspot.co.uk/2012/10/build-your-own-kendo-practice-dummy-for.html
Website: http://baddadgreatkid.blogspot.co.uk - for kids who aren't wrapped in cotton wool