My wife and I got these after my old bands from Gear Fitness snapped during Chest and Back (the bands were a few years old). We only use them for pullups currently as we are unable to do pullups to this point. These bands clip into the main bands so you can make your band go to 150 pounds of resistance.

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https://www.amazon.com/gp/product/B078JFSN9Z/ref=ppx_yo_dt_b_asin_title_o01__o00_s00?ie=UTF8&psc=1