On the importance of Zone2 training as the majority of the time spent training. This is the graph since I restarted running in 2022.
More green and yellow is good.
Red zones are when I'm training for specific races.
(end of 2022 I got an injury 😢)

Training  Zone 2 has been the biggest game changer. I know a lot of ppl don’t like it bc it is slower, but once you set that ego aside, the gainz and progress come exponentially quicker