买个类似这种

https://www.amazon.com/Filoto-Running-Resistant-Fitness-Adjustable/dp/B074NZR1RC/ref=sr_1_10?crid=18CF9NYOUF4TE&keywords=Running%2BBelt%2Bbag&qid=1703039074&sprefix=running%2Bbelt%2Bba%2Caps%2C385&sr=8-10&th=1