I used to run about 3 miles everyday. Haven't run in about 2 years now but started it up this week again. After I finish my jog (in the summer) I go to the nearest soccer or football field and do 20/40's. Sprint the field in 20 seconds and jog back in 40 seconds. I usually did that for half an hour. Every other day we'd do sprints up a steep hill. That was our endurance/cardio training for rugby.
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