Fitness Experts Agree—Zone 2 Cardio Is Great for Your Heart Health

Zone 2 cardio is a specific type of exercise that boosts your heart health—and it’s safe for most people to try. It refers to low- to moderate-intensity exercise that challenges the aerobic system and improves cardiovascular fitness, endurance, metabolic health, and the body’s ability to use fat efficiently as a fuel source.

Why Zone 2 Is Good for Your Heart Health

Zone 2 cardio is a specific exercise level with distinct health benefits.

“Zone 2 cardio refers to exercise performed at a low-to-moderate intensity where the body relies primarily on aerobic metabolism and uses fat as a major fuel source to produce energy,” George Yusuff, MS, exercise physiologist at Hospital for Special Surgery in New York, told Verywell.

“Physiologically, zone 2 is typically performed at or slightly below the first lactate threshold [LT1], the point at which blood lactate levels first begin to rise above resting levels. At this intensity, lactate production and clearance remain largely balanced, preventing substantial lactate accumulation and allowing exercise to be sustained comfortably for long periods,” Yusuff said.

When it comes to the heart, zone 2 is particularly helpful.

“Zone 2 training provides numerous heart health benefits because it strengthens the cardiovascular system while placing relatively low stress on the body. One of the most important adaptations is an increase in stroke volume, meaning the heart becomes stronger and more efficient, allowing it to pump more blood with each heartbeat,” Yusuff said. “As a result, the heart does not need to work as hard during exercise or daily activities.”

That said, all cardio is good for you. “Regular aerobic exercise, of any kind, can improve cardiorespiratory fitness, blood pressure, blood sugar regulation, and other cardiovascular risk factors,” Jenna Moore, MS, CSCS, senior manager of performance and talent at Tonal, told Verywell.

How to Tell If You’re in Zone 2

During zone 2 training, your heart rate will likely be around 60 to 70% of your maximum heart rate, Moore said. However, “percentages can vary by person to person and device to device,” she said.

If you’re not sure whether your morning run qualifies as zone 2 cardio, there’s a simple way to find out. “A simple practical measure to use is the talk test,” Moore said. “You should be able to speak in full, short sentences [during the exercise], but you shouldn’t be able to sing a song.”

What’s nice is that you don’t have to go to a gym to practice zone 2 cardio. “Common activities include brisk walking, easy jogging, cycling, swimming, and rowing at a steady pace,” he said. “It provides a wide range of cardiovascular and metabolic benefits while placing relatively low stress on the body, making it sustainable and safe for long-term consistency.”

And, if you work out regularly, there’s a good chance you already do zone 2 cardio. “For longevity and health, zone 2 training should make up the majority of most people’s aerobic exercise,” Yusuff said.

How Long Do You Need to Do Zone 2 Cardio?

To get the most out of zone 2 training, you should aim to spend 30 to 45 continuous minutes at this intensity, Yusuff said. “As fitness improves and exercise becomes a consistent part of the routine, sessions can gradually be extended to 60 to 90 minutes to further enhance aerobic capacity, cardiovascular health, and fat metabolism.”

If you’re going to combine zone 2 training with higher-intensity exercise, you should do the zone 2 portion first, Yusuff said. “High intensity exercise significantly increases lactate production as the body relies more heavily on carbohydrate metabolism. Elevated lactate levels can suppress fat oxidation, making it more difficult to remain in a true zone 2 physiological state,” he said.

Ideally, you should be implementing zone 2 cardio into your routine three to four times a week, Yusuff said.

Safety Considerations

On the whole, the biggest strength of zone 2 cardio is its low risk. “Many consider zone 2 cardio to be foundational, but not necessarily superior to other training zones,” Gabriel Ettenson, MS, PT, chief medical advisor at Hypervibe, told Verywell. “It’s generally recommended for the majority of aerobic training because it’s more sustainable and low-risk, not because it outperforms.”

An expert can help you ensure you’re ready for zone 2 cardio before you start, so you can begin a new exercise program with confidence, knowing it’s safe for you.

“Before starting any new aerobic exercise program, especially for individuals with cardiovascular disease, metabolic conditions, or other complex medical histories, it is advisable to consult a healthcare professional and undergo an appropriate fitness evaluation,” Yusuff said.