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I notice in RW's Garmin-Ready Marathon Schedule: Sub-4:00 when looking through the training sessions that there are only two days of hill repeats in this 16 week schedule. Likewise, there are only two fartlek sessions.
I think most runners would say that these are of value. If so, shouldn't there be more of them in the schedule? It doesn't seem that only two days of hill training would be of much value.