This is a good point. Whenever we're asked to change the metric, we should ask, "What does changing the metric actually do?" I've asked this question about cholesterol and blood pressure and haven't gotten good answers.

And finally, we don’t know that changing this metric will change your health for the better. I’m sure a good physiatrist or physical therapist could design some exercises to increase any of our standing-on-one leg times. And no doubt, with practice, you could get your numbers way up. But that doesn’t necessarily mean you’re healthier. It’s like “teaching to the test” — you might score better on the standardized exam, but you didn’t really learn the material.