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Anything over 85 percent, and youre in your maximum heart rate zone.

However, there is no science behind that formula.

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woman sweating in the gym

Heres What Experts Say

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A smartwatch is usually giving a target maximum heart rate based on age, not physiology, says Brawner.

Woman walking on a treadmill at the gym.

If my heart rate doesnt go up that high, there will be a disconnect.

Heart rate is just an estimate, and tech has lots of shortcomings.

You do get aerobic benefits with these exercises, but the training response is different.

Full body female athlete in sportswear using rowing machine during fitness workout in gym.

Think about how you feel.

You will see a lower heart rate at rest and during exercise, says Brawner.

The same exercises will feel easier, and youll have to work harder to feel effort.

Happy woman dancing and listening to music near a green empty wall outdoor in the city.

Thats a sign of improved fitness.

We need to be smarter than the technology, says Brawner.

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Healthy female training in the gym, performing a hip thrust.

A young black woman doing post-run stretches in the park on the road amidst green grass and trees.