You need a pull-up bar. Invest 30-something dollars in a door mounted one that you can remove, like this one. Use the bathroom doorway, that’s where I had mine during the lockdown.
This is the bar I use
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https://www.amazon.com/Ally-Peaks-Thickened-Multi-Grip-Strength/dp/B08MY2Y338
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the physics of it are interesteing.
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Athlean-X is where I look for exercise ideas: