Slow and steady. Fast and furious. Repeat. Improving your physical fitness can be as easy as that. Interval training combines short periods of high intensity exercise followed by longer periods of low intensity exercise. The result is improved cardiovascular fitness and more effective fat burning. But how does it work? http://www.uweightloss.com/interval-training-2/
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Slow and steady. Fast and furious. Repeat. Improving your physical fitness can be as easy as that. Interval training combines short periods of high intensity exercise followed by longer periods of low intensity exercise. The result is improved cardiovascular fitness and more effective fat burning. But how does it work? 
