The Cardio Myth

You don’t have to spend hours on a treadmill or run for miles. In fact, doing that can be counterproductive.

As Dr. Al Sears writes in his book, The Doctor’s Heart Cure, endurance exercise actually makes the heart, lungs, and muscles smaller. They can perform longer with less energy — but what you gain in efficiency, you lose in reserve capacity. In your later years, it is this reserve capacity that protects against heart attacks.

To improve the health and strength of your heart, focus on short intervals of intense exercise punctuated by brief periods of recovery.

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