The terms tempo runs and threshold are often used interchangeably, but they are different from one another. Tempo runs help your body clear out lactate as fast as it produces it, meaning you can run for longer. Your threshold pace, faster than a normal steady run, is when your body is unable to clear the lactic acid as quickly as it builds. Therefore, tempo runs can improve your VO2 max which helps more oxygenated blood reach the muscles.