However, here comes the pregnant mama who sets out on a solo 9-month endurance trip with no pre-coaching and still outlasts all known voluntary man-made athletic endeavors in the history of life. The study noted that prolonged activity above this metabolic ceiling would require burning energy reserves, which is not sustainable indefinitely as the digestive competence of the gut is maxed out. The basal metabolic rate (1,000 to 2,000 kilocalories for most people) can be described as the energy required to keep the body alive at rest. The brain shuts down intense activity as mental fatigue battles with the deep, inaudible but increasingly loud inner voice stating, “I am too exhausted to run another mile, and I do not want to do this, it is not worth it.” This is why athletes need coaches.Ī 2019 study reported that the metabolic ceiling for all humans is 4,000 kilocalories per day, roughly 2.5 times the basal metabolic rate. That being said, energy is not limitless, and there is a hard limit to human endurance before exhaustion sets in. However, unlike exercise that requires energy expenditure, hardly anyone remembers their meals in the last 24 hours because eating provides energy gain. However, we would go out of our way to let people know that we “walk or exercise all the time” and that we actually “don’t eat much.” It’s easy to remember the details of the last time we took a long walk in the neighborhood or the intense sweating session at the gym. Needless to say, physical activity is metabolically expensive, which explains why humans are inherently lazy.
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