What’s better?

It’s that time of the year again. Fitness advice is flying around everywhere.
As with most fitness advice you can find in December and January, there’s a lot of bad out there. One of my favorites: what’s better?
What’s better: very long runs at a slow pace or shorter long runs at a faster pace? What’s better: short intervals or long intervals? What’s better: interval workouts or tempo runs?
My personal favorite. What’s better: long, slow endurance or interval training?
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