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Why Fitness Newbies Should Avoid Intense Workouts

Why Fitness Newbies Should Avoid Intense Workouts

Insanity! Burnout! Super revved-up workouts are all the rage at gyms and online. One big trend: high-intensity sprint training. Long-favored by Special Forces elites and athletes like superstar wide-receiver Jerry Rice, it calls for warm up, short bursts of high-intensity running for about 30 seconds, followed by a couple of minutes of downtime.

But not so fast! Shredded or ripped might make sense if you’re preparing coleslaw, but unless you are a trained athlete diving right into such intense workouts can backfire.

A study of untrained guys reveals high-intensity workouts don’t make weekend-warriors healthier or stronger, or provide protection from heart disease and body-wide inflammation. Instead, they increase levels of stress in muscles and lower your ability to fight off damage from free radicals—molecules that can ding your DNA (ouch!) and are associated with increased risk of cancer, premature aging and organ damage.

Why? If you’re an exercise newbie, sprint training makes your cells’ powerhouse—the mitochondria—work at half capacity and have less ability to fight off damage from free radicals. In contrast, over time well-trained athletes build up antioxidant enzymes inside their cells to protect them from free radicals.

So, if you’re starting to build muscle, increase aerobic capacity and lose weight, grab a buddy and a pedometer and starting a walking routine, heading for 10,000 steps a day. Only go for high-intensity exercise after you’ve done muscle-building resistance training and increased your workout intensity gradually. We like the interval walking regimen that gives you a safe, sweaty boost.

Medically reviewed in April 2018.

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