FARTLEK

Same as running up stairs, but you don't need stairs.

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Another fifteening.com tool that helps people move more.

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Do a quick FARTLEK BOOST for your heart and lungs...

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Being out of breath from time to time is essential for good health.

Play the video and sprint like crazy, on the spot, a few times a day.

It's so quick you don't have time to get hot, but your heart-beats are huge.

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FARTLEK is the old interval training trick that athletes have used for years. It's not new but it sure works.

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Btw, kids love FARTLEK too because it's quick and funny.