Most entrepreneurs are familiar with diminishing returns: how, when other variables stay constant, at some point putting in additional time and effort results in increasingly smaller results. Since resources are always limited, figuring out where to spend your entrepreneurial time so it delivers the best bang per hour is critical.

That same premise extends to health and fitness. If you’re like many entrepreneurs, you try to stay reasonably fit not just because it’s good for you, but because exercise helps you perform better under stress. Can elevate your mood for up to 12 hours. Can even make you a little smarter.

Still: how healthy and fit . . . is healthy and fit enough?

If you want to run a marathon, your definition of “fit” will differ from most. But if you want to compare yourself

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