In a previous blog post we described the 3-zone model for intensity distribution, and how it was related to the polarized training concept adopted by many high-level endurance athletes. But how does the 3-zone model relate to the very common 6-zone model used in cycling? The 6-zone model for training intensity distribution in cycling is probably the most commonly used model used to control training intensity among cyclist, mountainbiker and gravel riders. The 6 zone-model is