Building the Pyramid

I have a good foundation with lots of time is Zone 2. Now it is time to work on Zone 3 the next layer of my pyramid. This morning I rode continuously in Zone 3 for 30 minutes with some time in Zone 4. I wanted to focus on muscle endurance so I kept the rpms lower near 80rpms. I could of gone longer but decided 30min was a good start. I may do another workout like this later this week.