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I ran a 7:13 mile in 7th grade, and then a 7:00 mile in 8th grade, and then 3 miles in 22 minutes in 11th grade. Haven't really been running that regularly since, so now I do an 8 minute mile once a month or so at the gym, but usually just put the treadmill on "cardio mode" or whatever and run however fast they tell me for 30 minutes to get into my target heart rate to take of my heart and lungs.