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Or buy one 30lb kettle bell. No running shoes, low cost, no finding space in your home, no buyer's remorse.

A swing with good form works your entire body. 100 reps once or twice a day literally takes 2-4 minutes. Do it after hitting start on the microwave.

An exercise that takes 2-4 minutes is not the same as a HIIT exercise where you exhaust yourself in 30 seconds.

Swing it faster.

That's high-impact exercise a sizable fraction of people cannot do and has inherent risks of serious injury.

HIIT isn't necessarily high-impact.