Zone 2 is the pace at which you can still speak in sentences. Why it multiplies mitochondria, trains fat burning and protects the heart, how to find your zone and how much per week makes sense.
In short
- Zone 2 sits at 60 to 70 percent of maximum heart rate: hard enough to sweat, easy enough to talk.
- It is the strongest stimulus for new mitochondria and trains the body to use fat as fuel.
- 150 to 180 minutes a week, spread over three to four sessions of 45 minutes, are the goal.
- Plus one session of short intervals a week for VO2 max; the combination is the endurance recipe of longevity.
What zone 2 is
Training zones divide intensity by heart rate. Zone 2 sits at about 60 to 70 percent of maximum heart rate, for a fifty-year-old roughly 105 to 120 beats per minute. The talk test is simpler: in zone 2 you can speak whole sentences but not sing, and you would rather not take a phone call. It feels too slow, and that is the point: most recreational athletes train too hard for zone 2 and too easy for intervals, in a gray area that delivers neither.
Why zone 2 works
In this range the muscles work mainly on fat as fuel, and the mitochondria run at full load without lactate accumulating. That is the strongest stimulus you can give them: after eight weeks of zone 2 training the muscle cells have more and larger mitochondria, burn more fat, take up sugar better and are more insulin-sensitive. The heart grows and beats more slowly, resting heart rate falls by 5 to 10 beats, blood pressure drops. And the aerobic base carries every other effort, from a hill run to the stairs with shopping bags.
Finding the zone
Most precisely with a lactate test, in practice the formula suffices: maximum heart rate after Tanaka, 208 minus 0.7 times age, of which 60 to 70 percent. It gets more precise with the Karvonen method, which includes resting heart rate; the cinalia heart rate calculator does that. Without a watch: talk test and nasal breathing. Whoever can breathe through the nose is in zone 2.
How much and how
150 to 180 minutes a week, spread over three to four sessions of 45 to 60 minutes. Shorter sessions bring less because fat burning only runs fully after 20 minutes. The sport does not matter: brisk uphill walking, cycling, rowing, swimming, running for the trained, cross-trainer. For the untrained brisk walking with incline is already zone 2, running would be zone 3 or 4.
The complement: intervals
Zone 2 builds the base, intervals raise the ceiling. Once a week four times four minutes at 85 to 95 percent of maximum heart rate, with three minutes of rest, raise VO2 max, the maximum oxygen uptake, the strongest single fitness marker for life expectancy. Together with two strength sessions that makes five to six hours of training a week, the program longevity physicians recommend today.
Try it
Heart Rate ZonesAge and resting pulse: your maximum heart rate and the five training zones after Karvonen, with zone 2 as the fat-burning range.Step CalculatorSteps, height, weight and pace: kilometers, calories, minutes and how much is missing to your daily goal.Fitness Age CalculatorResting heart rate, push-ups, one-leg stand, flexibility and grip strength: how old your body is functionally, in years.Frequently asked questions
Does walking count as zone 2?
For the untrained and older people yes, especially with incline or at a brisk pace. For the trained it is zone 1, so recovery, but still healthy.
Do I need a heart rate monitor?
Not necessarily. The talk test and nasal breathing are enough. A watch helps keep the pace, because most people unconsciously speed up.
Can I split zone 2?
Two sessions of 20 minutes bring less than one of 45, because fat burning takes time. If there is no other way, two short ones beat none.
This article is general information and not medical advice. If you have symptoms or existing conditions, or before changing any medication, talk to your doctor.
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