Question about habits for you highly effective people. Do you exercise? & do you consider that an integral part of your success?
There are no metrics. It's mainly about learning the limits of your own body, and situation awareness of when/where your main work causes you to hit a bodily limit, and working on that bottleneck. Metrics are for athletes and body fetishists.
Loading seems to be taking a while.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.