Runs of 5 to 20 minutes at a pace just a little slower than your 10-K racing pace. Threshold pace is roughly equivalent to what exercise physiologists call “lactate threshold,” or the point at which your muscles start fatiguing at a rapid rate. Running at or near lactate threshold is believed to raise your lactate threshold, which should allow you to run faster in the future.

See more definitions in the Definitive Guide to Running Terms.

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