A classic speed-endurance workout that involves efforts gradually increasing over a set time.  It is to start slowly and gradually increase the pace of your run until you are pushing hard at the end. This develops endurance, as this activity makes you run on increasingly fatigued legs. This specific type of training teaches mental discipline, patience, and race management techniques essentially required to avoid second-half slowdown.

Also called pacesetter are experienced runners leading mid/long-distance running events. They are tasked to complete the course in a given time and avoid excessive tactical racing. Sometimes informally called a rabbit, pacemakers are frequently employed by race organizers for world record attempts with specific instructions for lap times. 

The pace is the time an athlete spends covering a certain distance. Usually, the pace is measured in minutes per mile/minutes per kilometer. The slower you move, the lower your pace. As your fitness improves, your running pace will increase. The training process is based on heart rate, and the pace itself will increase over time as you exercise. The pace is a secondary metric for beginners.