A threshold run is a sustained run at or near lactate threshold—usually a pace just slower than your 10K race pace—designed to build endurance and stamina. Threshold sessions are usually between 20 to 40 minutes long but are also doable in segments of 5 to 20 minutes. They induce lactate production in your body more quickly. This form of running conditions your body to expel lactic acid efficiently so that you are able to run longer and quicker. These are more challenging but less exhausting than interval workouts. They form a crucial element in most endurance schedules, incorporating both speed and aerobic work without exhausting you as much as more rigorous interval workouts do.
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