I was raised on the notion that sweat was a symptom of not thinking well enough to avoid it. I was the least fit kid at school. Then, I re-discovered bicycling for the quick, cheap commuting, and my resting heart rate went to 52. I very seldom noticed any fatigue or other discomfort. I drive a car now, but notice that if I get my exercise from carpentry or gardening, I really feel it, but if I go for a ride, I burn more calories with no discomfort, while doing more good for my heart and lungs.
Re: OT - If there were about 15% more vegetarians, there would be enough food for everyone, even though vegetarians live 5 years longer. Ranches are replacing forest at a frightening pace.
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