In the chronic illness world, spoon theory is a common analogy. When I was in triathlon world we would use a box of matches analogy, light a match when you need energy but once the box is empty, no more energy. The battery analogy is also a good one and Garmin call it the ‘Body Battery’. A jar of marbles is another analogy using the same concept. Your Energy Envelope is another term you will hear to represent how much energy you have left. There are probably more analogies, but they are the ones I know that represent the same concept.
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