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If it was a very windy day, can that effect your training, how much slower do you expect to run a 10km run?
Honestly, if some of the miles are into a serious gale then you can be minutes slower per mile....let alone the full distance.
Eat less baked beans!
on the roads
ALso do you get a similar benefit with the wind behind you?
You'd be on for a personal best over a flat/straight route with the wind behind you all the way!