Two principles to choose the right resistance level : 1.When the bands are used as assisted pull-up bands: We recommend that beginners and big body weight chose #3 Purple or #4 Green band, while the advanced and light body weight are suitable to use #1 Red or #2 Black. 2.When the bands are used as resistance bands: We recommend that beginners start from#1 Red or #2 Black, while the advanced can proceed to #3 Purple #4 Green, #5Blue. Introduction: Thank you for taking your time on our products from our store. We do as much as we can to offer you our best products,which could protect you from injury and relieve your pain. If you have any questions about any of our products please just feel free to ask us. Feel comfortable to buy.-We are serious about our every product - If it isn't what you are supposed to get, we offer a 30 days money back guarantee.
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