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RE: Speed Endurance Intervals: 13x400 r75"
Of course not... I did a couple of times in the past but you have to spend a lot of time doing so...
It is fine if you use the preprogrammed Garmin plans but, I prefer my plans ;-)
Personally I do it every time because I don't run on a track so I need to know the distance for each interval. It takes time at the beginning but now I just modify my existing trainings :)