What Is Zone 2 Cardio and How Often Should You Do It?

Zone 2 is low-to-moderate aerobic effort where you can still hold a conversation, roughly 60 to 70 percent of maximum heart rate for many people. A common suggestion is two to four sessions of 30 to 60 minutes per week alongside other training.

What zone 2 means

Zones divide effort by heart rate or by lactate levels. Zone 2 sits just below the point where lactate begins to accumulate faster. In practice it feels comfortable but purposeful, and you can speak in full sentences while breathing a bit harder.

How to find your zone

Talk test: you can speak in full sentences but could not sing.
Heart rate estimate: about 60 to 70 percent of maximum heart rate, or 180 minus age as a rough rule. These are estimates and can be off by a lot.
Lab testing: lactate or gas exchange testing gives a more accurate measurement.
Nose breathing: being able to breathe through the nose is another rough check.

A starting protocol

Choose a low-impact mode: brisk walking, cycling, rowing, swimming or jogging.
Begin with 30 minutes, two times a week, and build toward 45 to 60 minutes.
Keep effort steady, adjusting pace as heart rate drifts upward.
Add one or two harder sessions per week if desired, keeping most training easy.

What the research says

Reviews of elite endurance athletes found that most train with about 80 percent of sessions at low intensity and 20 percent at high intensity. Research from San-Millan and Brooks reported that well-trained endurance athletes showed greater capacity to burn fat at moderate intensities than less-fit individuals, which is the basis for the interest in zone 2. These are observational comparisons, so they do not show that zone 2 training alone causes metabolic improvements. For the general population, meeting overall activity guidelines matters more than the exact zone.

Fitting it in

Zone 2 is gentle enough to repeat often, and works well on recovery days. See the exercise and recovery guide for weekly structure, and consider the sauna protocol afterward. Strength work and creatine address a different training goal.