Manuals and User Guides for Body Flex Sports Body Rider BRT3980. We have 1 Body Flex Sports Body Rider BRT3980 manual available for free PDF download: Owner's See the Owner's Manuals below for assembling your Body Flex Sports equipment: BRD2080 Body Rider 2-in-1 Dual Trainer Elliptical and Upright Stationary3-in-1 Trio Trainer BRT3980/3880 * This item is for consumer use only and it is Please read this manual carefully before commencing the assembly of your PLEASE KEEP THESE INSTRUCTIONS FOR FUTURE USE & REFERENCE. DO NOT DISCARD. BRT 3980/3880 During the warranty period, Body Flex Sports.