I want to understand to which category belong the workouts described in the above mentioned article from UA site. When I compare them to the workouts described in the training plans they are shorter than ME workouts (weighted hill climbs), but longer than max strength workouts (hill sprints).
If we speak about periodisation, in which period of the training program should we place them?
From what I understand I think the Z4 intervals come just after the ME phase to get the most benefit. Probably want to do some Z3 intervals during your ME phase, within reason. Will look in the book later to confirm.