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How to build a ninja warrior course
Find a good spot to build your course.
Pick the spot where you want to build your course before you draw up your plans, since you might have to account for narrow spaces, low-hanging tree branches, or other environmental factors.
Pick a spot that's free of dangerous obstructions like protruding tree roots or sharp rocks.
The best place to build is a big, open backyard where you'll have plenty of room to run, jump, and swing. Take measurements of the space where you want to build so you can plan the exact dimensions of your course.