There's a good piece by Jack Thurston about this on the Brooks' blog.
http://blog.brooksengland.com/wps/ride-eat-sleep-repeat-x-365/
Thanks. Was on my phone, refereeing a fight between the 5 year old and the 2 year old, so couldn't post the link.
(It's a mis-match btw, the 5 year old understands the Queensbury rules, whereas the little one can bite, scratch and gouge).
@hippy started
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There's a good piece by Jack Thurston about this on the Brooks' blog.