How you occupy your empty times?

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I'm still undergraduate,so i hv an empty time when it weekend.instead of studying,the most enjoyable thing that i like to do when empty time is to go window shopping.Sometimes,i went to the mall without any reason and do nothing.hehe.but u know what,when i walk in a huge mall,i realize that act i'm doing some exercise.so why not,we always walk in a mall to get the benefit of exercises instead of waste ur money rite??...