Fitness Tips :
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High Intensity Interval Training – or, HIIT – is a highly effective way to burn calories, speed resting metabolism, and strengthen and condition the human body. It’s also a lot of fun. Here are 9 ideas for your own next HIIT fitness workout. #interval #training #HIIT #overfiftyandfit #burn #calories #metabolism #strength #conditioning #human #body #over50 #exercise #ideas #fitness #workout
