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Over the past three months, I have been partaking in lot's of interval training, tempo runs, fartleks etc... all on grass surfaces
14x500m - 1min20seconds rest
14x200m - 30seconds rest
5x1mile - 3minute rest
14x80m Hills - Varied recovery.
I could easily do 5 of these sessions a week, with no injury or fatigue.
However, if I partake in a long slow run you can guarantee that I will suffer a running injury. For instance, Friday morning I did an 8.5 mile run and Sunday morning 10mile run. Both slow. And my achilles is sore after completing both. Could it just be, that my body is not made for these longer distances? I am a sprinter naturally, very quick. I cannot comprehend how my body recovers so incredibly well after tough shorter sessions and yet leaves me crippled after a easy slow run?
Before, you shoot me down I am currently resting, to heal my achilles.