As a general rule, most trail 50Ks are easier on the body than road marathons. The former is a mix of running, shuffling, walking and jogging different speeds with a variety of stride lengths and foot strike angles. The latter is the same motion over and over and over again.
A strong backpacker can finish many trail 50K courses without any run training.
Well, for most people they do not accomplish the same thing. Training per miles promotes running faster than MAF, e.g., the horse heading back to the barn effect. Running by time encourages people to slow down, staying well under MAF.
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