You Can Churn Butter While Running

An essential part of the process of turning cream into butter is continous, vigorous motion. That's similar to the up and down motion of long distance running. Runner's World reports that some runners are multitasking effectively by strapping on packs of milk.

In a demonstration video, runner Libby Cope and her boyfriend ran five and a half miles with a mixture of cream and sea salt. After removing the excess water at the end, she had usable and tasty butter.