The value of the training effect is best described in a Nov '09 Running Times article by New Zealand Olympian Lorraine Moller. A key excerpt —
"Training can be defined as specific stress applied to the body to invoke a corresponding adaptation. The training stimulus (workout) causes a temporary breakdown in the body (catabolic phase) followed by the adaptive period (recovery), during which the body rebuilds itself so as to better withstand the stress that it has just endured (anabolic phase).
Breakdown and buildup better than before, breakdown and buildup better than before; this is the rhythm of effective training.
Interestingly, the desired training effect does not take place during the workout but during the recovery. We improve not while we are training but while we are resting. More often than not, bad training is a mismatch of breakdown and buildup: either the workout is too hard or the recovery is inadequate, or both. Rarely among motivated athletes is it the result of under-training."
Your problem: running as far as possible every day will break down your body (it's already happening) and only lead to disappointing racing results.
The solution: every workout of the week should have a specific purpose that serves catabolic OR anabolic goals. To become more familiar with fundamental training principles, I recommend picking up a copy of Pfitzinger's Road Racing for Serious Runners. Read it cover to cover and you'll benefit greatly.
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