7. HIIT is great for your heart
Flexibility isn’t just important when it comes to touching your toes. “HIIT increases the flexibility and elasticity of arteries and veins better than continuous aerobic exercise,” says Weiss. “Because HIIT increases pressure demand on your blood vessels, they actually get a workout as well.” In fact, high-intensity interval training is not only safe, but also easier to tolerate than a more moderate workout in people with coronary artery disease, according to one study.
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