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Thus strength training gives your metabolism a boost far beyond the duration of the actual workout, for as long as 48 hours. In contrast, after aerobic training your metabolism returns to normal almost immediately. So with interval training we’re not only building muscle, but we’re also able to kick up our metabolism long after–even when sleeping! Many people believe aerobic activity strengthens their heart, and decreases the chance of things like coronary artery disease. Yet, after much research, even U.S. Air Force Cardiologist Dr. Kenneth Cooper–the very man who coined the term “aerobics”–now believes there is no correlation between aerobic performance and health, longevity, or protection against heart disease. On the other hand, aerobic activities do carry with them a great risk of injury. Most, even so-called “low impact” classes or activities like stationary cycling, are not necessarily low-force. And things like running are extremely high-force, damaging to your knees, hips and back. Aerobic dance is even worse. Sure, you’ll hear the occasional genetic exception declare that they’ve never ever been injured doing these exercises. But overuse injuries are cumulative and often build undetected over years until it’s too late, leading to a decrease or loss of mobility as you age, which, in turn, too often leads to a shortened lifespan.
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