Physics puzzle: chin-ups.

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This cannot be determined conceptually.

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He isn't looking for some kind of rigorous proof of an exact number which doesn't even necessarily exist. I would assume he's looking for some kind of argument, based on some reasonable physical assumptions, to make an educated guess. This kind of thing is interesting in its own right.

pzhon, it's an interesting question. I'll think about it for a bit.

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I don't see how the educated guess could be very accurate considering the subjective nature of physical training. Think about this: a person is well-trained in curling but poorly trained in chin-ups. This will make a huge difference in the results. I know from experience that the body adapts to specific motions. One person's body may adapt better to one than another.

This is why the impossibility of finding an answer. I agree it was interesting too, until I thought of this roadblock.