could do bug obstacle course DIY American Ninja Warrior Backyard Obstacle Course - Five different elements. Build and re-build this obstacle course, and then it breaks down for storage. Storage ideas in the post.
Kids bday idea or camp challenge - obstacle course! Inspired by Tough Mudder - the Barbwire Crawl!
Awesome playground idea to build in the backyard for the kids.
Mincing Thoughts: Kids Climbing Play Structure - Building a Climbing Wall and Cargo Net
32 Of The Best DIY Backyard Games You Will Ever Play- backyard obstacle course.
Old tire climbing wall