Running is a popular form of cardio since it's easy to start a routine and the perfect way to relax your mind and de-stress. How fast, how long, and where you run can all affect how many calories you burn, but one thing's for sure: with a regular running habit, you can have sexy, toned legs by Summer's start.
Seven-week calorie burn: Running a 10-minute mile for 45 minutes (4.5 miles) three times a week will burn 8,505 calories over seven weeks.
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