Zwift is an online community of like minded athletes united in the pursuit of a better indoor training experience. Created by cyclists for cyclists, Zwift brings the things we love about outdoor cycling indoors and adds a dose of fun. Yes fun!
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https://www.facebook.com/gozwift
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Unofficial Guide
https://docs.google.com/document/d/1WZ3rvtip6WNjGOszANnpZUYEAnkAlVvRqa6MvnHhst4/mobilebasic?pli=1