some experience on exercise

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Once in my middle school, i ran almost 10km everyday in order to lose some wight(of course i was 65kg with the height of 160cm). All these exercises made me in good health at that time. However, when I came to the college, I was addicted to watching TV and going shopping, and doing exercise was forgotten. And now, i am working in a company, which have a lot of activies, especially hiking. while the fact is, i could not even run 3km at one time at present. What should I do? Do you have the same experience ?