Tempo runs or anaerobic threshold runs are stamina building exercises for runners. The run is designed to help your build your stamina, mental strength, and help your run longer.
How do tempo runs work? They are what I like to describe as ‘middle grounds runs.’ When you engage in intense workout sessions or exercises, your body consumes more oxygen than you inhale, so your body switches from aerobic respiration which makes use of oxygen, to anaerobic respiration which makes use of Lactic acid or lactate.
The body can’t run for extended periods on lactic acid so after some time it shuts down due to lactic acidosis or poisoning. The time frame within which our respective bodies can run on Lactic acid differs with respect to how much we exercise, (how much stamina we have built up) and in some rare cases, how much lactic acid our bodies naturally produce. Tempo runs seek to create balance between how much lactic acid our bodies produce and the rate at which we use it up.
How to do it: tempo runs work perfectly in a 50-minute cycle. Begin at an easy pace which should last about 20 minutes, increase your pace to a level you feel you would be able to sustain for an hour, then slow down to an easy pace in the final 10 minutes.
Every runner should go on at least one tempo run per week, as it is perfect for building stamina and endurance.