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Most runners are not undertrained. They are training every run at the same medium effort. This page is about fixing that.
The two things that decide a running block are how much easy volume you can absorb and how honestly you separate easy from hard. Zones exist to keep those apart; intervals exist so the hard part is hard enough to matter.
Read the zone material first if your easy runs feel tiring, then the interval material, then pick the distance you are chasing.
What each zone is for, and why most easy running is run too fast to do its job.
Interval structures, and how to pick one that fits the distance you are training for.
Your coach builds the block around your current pace, the days you can run and the race you picked.
