Isn't one reason because of how knackered and sore you are for about 10 days after the real race? I wouldn't be out 6 days a week if I was running 20 miles at race pace on one of them.
Richard, imagine how knackering 20miles at goal pace would feel in training!
I'm sure most plans would involve a gradual step up in MP miles though, but surely none up to 20.
Well there is the aspect of the 'double step up' to consider.
That's where on marathon day you find yourself attempting to run further than trained and faster than trained at the same time.
In these days of gels and the like, I doubt if hitting the wall is a factor. That was from the days when nothing but one drink of water was allowed.
Most so called marathon walls are just a gradual muscle collapse due to the sheer time involved.
Could just do the long runs a bit faster. Closer to race pace.
I read recently that Patrick Makau does about 80% of his long runs at race pace! Special case perhaps! General consensus is to stay about a minute slower, to avoid injury and train your body to be active for the distances it has to face come race day
I will do the majority slower ( 60 - 90s) for time on feet, physical endurance, more efficient fat burning, run on empty and hope to improve greater glycogen capacity in the future, because its my favorite run, because I run on slower surfaces etc.
Then I do the odd few on road, and progressively up the pace.
Have a look what Mcmillan says to those worries long slow runners:
Richard. Stride length comes from speed, so yes, running slower will produce a shorter stride.
Save your MP for the race itself, apart from sections, such as at the end of a training run or a shorter midweek run. Otherwise you'll burn out, get injured or simply not recover in time...also other training runs such as tempo runs could be compromised because you're too tired.
Not necessarily true, horse piss shoes. I've been experimenting with stride length a bit and shortening my stride and increasing speed. It's a significant increas in 'strides per minute' but can be quite effective on injury prevention.... and reputedly is more efficient that my previous longer striding form.
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