Joined: Jul 2002
Posts: 40,863
Likes: 3,115
From: Sacramento, California, USA
Bikes: Specialized Tarmac, Canyon Exceed, Specialized Transition, Ellsworth Roots, Ridley Excalibur
There's no minimum speed for Zwift. If your trainer set up is compatible with it, I'd say give it a try. I would sign up for one of the beginner FTP improvement training blocks. If you do the workouts as prescribed, you'll see improvements.