A tempo run is a type of training run designed to improve a runner's speed and endurance. It typically involves running at a "comfortably hard" pace, which is faster than an easy run but sustainable for a longer duration. This pace is often around 80-90% of a runner's maximum effort, helping to build lactate threshold and overall performance. During a tempo run, athletes usually maintain this challenging pace for a set distance or time, often ranging from 20 to 40 minutes. Incorporating tempo runs into a training plan can benefit runners preparing for races, such as a 5K or marathon, by enhancing their ability to sustain faster speeds over longer distances.