Joe Friel’s High-Performance Cyclist Quotes

“The only other time zone 3 is important to your performance is when you are in the final weeks of preparing for an event that will be largely conducted in zone 3, such as a gran fondo or century ride. Other than that, it’s best avoided, especially when concentrating on aerobic endurance.”
― Joe Friel, Joe Friel’s High-Performance Cyclist: The Complete Training Manual