If you wear a Fitbit, Apple Watch or a similar wearable while working out, you already know that you have a useful tool right at your fingertips. One especially helpful feature wearables like these ...
14don MSN
The heart rate zone formula is flawed, especially for women. Here's how to rethink your training.
That tension becomes especially clear with heart rate zone training, a popular five-tier system that endurance athletes use ...
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