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 has 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.

from Fitness News — ScienceDaily http://bit.ly/1WIf2X2
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