Forget guesswork. By understanding these five heart rate zones, you can optimize every workout and experience maximum results.

In the lower heart rate zones—typically defined as zones 1 and 2, and sometimes even up into zone 3—you’re helping your body recover from harder efforts, strengthening type I muscle fibers ...

Zone 5: The last zone is Zone 5, where heart rate is between 90% to 100% of your maximum predicted heart rate. It’s only possible to stay in this zone for a few minutes due to the level of exertion.

Zone 2 cardio is the latest exercise trend, and it's based on the longstanding notion that keeping your heart rate within a specific range can help you get more out of a workout.

Zone 2 cardio is the latest exercise trend, and it's based on the longstanding notion that keeping your heart rate within a specific range can help you get more out of a workout.

In general, heart rate zone 2 matches power zones 2-3. But your heart rate drifts upward the longer you work out, and your heart rate also takes longer to change when you shift gears.

Zone 2 cardio is the latest exercise trend, and it's based on the longstanding notion that keeping your heart rate within a specific range can help you get more out of a workout.

Zone 2 cardio is the latest exercise trend, and it's based on the longstanding notion that keeping your heart rate within a specific range can help you get more out of a workout.

Zone 2 cardio is the latest exercise trend, and it's based on the longstanding notion that keeping your heart rate within a specific range can help you get more out of a workout.