I believe you’ll develop speed via strength work which includes hill running, either repeats, or running hilly courses as the Kenyans do on a steady basis.
You can manage 50 people through the strength of your personality and lack of sleep. You can touch them all in a week and make sure they’re all pointed in the right direction.
Strength is one of those things you’re supposed to have. You don’t feel that you have it at the time you’re going through it.
There is nothing respecting which a man may be so long unconscious as of the extent and strength of his prejudices.