Zwift racing vs Base Building: Which is the best way to build fitness over winter? Feb 13, 2021 (Photo by Robert Cianflone/Getty Images)During another national lockdown, Vicky Ware assesses whether continual Zwift racing is a safe and effective way to build fitness over winter Tags: General News News Zwift Share 0 Share on Facebook Tweet Tweet on Twitter +1 +1 on Google Plus