I put in a pull up bar in my room.

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This first involved getting my parents to agree to me drilling holes in the ceiling and convincing them that the roof wouldn't fall down.

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The plan was to get strong nylon rope and fish it over two of the rafters, and then use a rope ladder lashing to attach a rung. I fished it using a hanger and a weight.  Didn't take as long as I thought either.

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I then 3D printed a couple of hole covers so that the rope doesn't dig into the drywall and expand the hole over time.

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I can now do all sorts of crazy trapeze acts in my room, hang upside down, twist myself, swing and jump off onto my bed.  All this also helps build up my core muscles with pull ups and crunches etc.