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The lactate threshold (LT) (or lactate inflection point (LIP) or anaerobic threshold (AT)) is the exercise intensity at which lactate (more specifically, lactic acid) starts to accumulate in the blood stream.
In general, to achieve an aerobic effect, you will want to elevate your heart rate to 65% to 85% of your maximum heart rate and maintain that level for a minimum of 20 consecutive minutes. The first step in determining your target heart rate is to calculate your maximum heart rate.