As Tony Stark once said: Oh yeah, I can fly.

So this morning, I did something unusual in my Five Fingers Sprints: I actually sprinted.

For proper context: I was fast as a kid. Usually the fastest kid in the class, up until I was about twelve or so, after which I generally avoided exercise. Since then, I have done occasional distance running, building up to running a couple of marathons in the 90s. In the process of training for those marathons, though, I destroyed whatever sprinting ability I had. The way Clydesdale-class distance...