I started training for a triathlon. Today I ran for fifty minutes. I’ve been training slowly enough that I really can run for fifty minutes. But I get bored. And I have to play mind-games. Run 30 minutes. Then run 10 minutes past this spot. After that turn around and run 15 minutes in the other direction. Then run 5 minutes back, and you’ll be at your car.

I started training for a triathlon. Today I ran for fifty minutes. I’ve been training slowly enough that I really can run for fifty minutes. But I get bored. And I have to play mind-games. Run 30 minutes. Then run 10 minutes past this spot. After that turn around and run 15 minutes in the other direction. Then run 5 minutes back, and you’ll be at your car.