Yeah, what's the magic number? Who knows! If your out of shape and just getting by, you are not only putting yourself at risk, but those that would try to save you.
For me--When I do anything.....eat, drink, and exercise (spend money) my first thought is "How is this going to affect my diving?"
For me--When I do anything.....eat, drink, and exercise (spend money) my first thought is "How is this going to affect my diving?"