Training Virtual MTB Skills Progression [Cartoon] By Jeff Barber January 8, 2021 Your turn: Caption this video in the comments below. Share This: Tweet Jeff Barber Jeff co-founded Singletracks.com with his wife Leah (mudhunny) in 1999. Today he works out of Singletracks World HQ in Decatur, GA as the publisher. Subscribe! Enter your email address to receive our top stories via email each week.