First, the 2000s are not really interval workouts, but tempo pace with 60 meter dashes.
I don't really believe in long intervals because they take so long to recover from (although I do get a kick out of the Yassos, and I find that 1000 meter hill repeats are essential if you are to run hilly courses like Boston or Quebec City).
Also, the shorter intervals allow me to incorporate a few 'technical routines' (I don't know how you call those in English but in French they're called 'éducatifs') to promote better leg turnover (and generally stronger legs).
As for fading (I'm touching wood), it's never happened yet, although I really am more a triathlete than anything else. My feeling about runners who fade are that, he/she is having a bad day, started too quickly, or has neglected general form (especially mid and upper body) and technical routines (you can see it by the crunched posture and poor leg turnover.
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