Doorframes and climbing
Photos are probably links. The first few are, anyway.
The important things

Children can only hear "no" so many times before they start to ignore it, so we helped them make good decisions when they were young, and saved "no" for really important things.
photo by Janine and it's a link

EASIER TO ADD HERE: Ability and Opportunity, on my blog—there are several other similar images now.

Toy Guns Snowmen over the Dodd years Halloween Costumes

More doorways