Often times in the natural environment reasoning and memory work are luxuries. Reaction is far more prevalent. How stressful was the exercise do you figure?
Assuming you would undergo such an exercise on a regular basis, you would naturally adapt to the conditions more and more, relieving the stress as your body and mind learn to cope, and learn to negotiate the limitations. Our reasoning ability provides us with perhaps the greatest chance of adapting to our environment and any changes we encounter of perhaps any creature on the planet.
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The ultimate result of shielding men from the effects of folly is to fill the world with fools.
-- Herbert Spencer, English Philosopher (1820-1903)