Is it worth it? Hill sprints

They hurt your legs. They burn your lungs. They make you feel as if you’ve never exercised before…

What is it? Sprinting up a hill, on purpose, for fun, whichis weird. 

How much does it cost? Unless you want to buy your own hill – which you don’t – they’re free.

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from Health & wellbeing | The Guardian http://ift.tt/20JUj7q
via health