Warning: High-intensity training could hurt you if you’re not an athlete

High-intensity ‘sprint training’ may be gaining popularity at gyms, but if you’re new to this form of exercise, the workout could do more harm than good.A study by Canadian and European researchers found signs of stress in the muscle tissues of their non-athlete, untrained subjects after ultra-intense leg and arm cycling exercises. Perhaps more concerning, researchers reported the untrained subjects had a weakened ability to fight off free radicals, molecules that can alter DNA and harm healthy cells. —> Read More