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He bolted a chair to the bottom of the tree house and has a safety belt to catch him should he fall.

It’s going to tell you a story, it’s going to feed you good food and it’s going to keep you safe, as long as you buckle your safety belt and pull down on the handlebars.

Doing so increases the tensile strength of the bags so much that they’re actually stronger than traditional plastic—as mighty as nylon used in parachutes and safety belts.

According to The Paper, the acrobats had worked together for "many years" and they had often performed without safety belts "for the sake of looking good".

Then make sure that all drivers and passengers buckle the safety belt.