Not running-fast workouts. Not race-pace workouts. I mean 100-meter sprints. A full-out, balls to the wall, every cell in your body straining, sprint. The kind of races that Olympic runners do in 9-odd seconds and this old man does in 16.
This is your life. Its awesomeness is eluding you. Pay attention.
Want to know if you will live another 10 years?