A one-to-one work-to-rest ratio, such as a 5-minute mile followed by 5 minutes of rest, is an ideal but often unrealistic protocol for sustained hard work.

“Ideal situation is what a runner would do is like what we'll call mile repeats, 'cause they're running four or five minute miles. Whatever time it takes them to finish, they're going to rest that. So it's a one-to-one work to rest ratio.”