
Originally Posted by
Chromium4500
This is actually something that I struggle with every year. Over the winter months, it's simply too cold to run outside. During this time, my cardio switches to indoors at the gym. When spring finally comes and I head outdoors, my easy treadmill 2 mile run becomes a grueling 2 mile slog against my own muscles.
From reading and listening, this is what I believe is going on.
Even when setting a treadmill on random, interval, hill-climb mode; you're still running on a perfectly flat surface at a computer controlled consistent pace with no obstacles. When running in the real-world; you're dealing with an imperfect surface, traffic, twists and turns, etc. Your body is expending far more energy just stabilizing your core each time you jog slightly left to avoid a pot-hole or the road suddenly slopes off to the right and you compensate by leaning into it.
My theory is that the autonomic activation of these secondary and tertiary muscle fibers used to stabilize your trunk draw available energy away from the actual process of propelling your body forward.
Long story short... maybe something like 2 miles on a treadmill = 1 mile in the real world.
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