1.   As an army lieutenant, Zatopek was a pioneer in the method of interval training, which meant repeating short distances instead of taking long, slow runs.

2.   He developed interval training, which all elite runners now use.

3.   Heard about interval training?

4.   Interval training essentially means alternating periods of swimming with periods of rest.

5.   Interval training is a grind.

6.   Once a week, Rogers has me do interval training, alternating sprints with walking.

7.   She pushed herself to compete, and she stopped shot-putting and she stopped interval training.