On the off chance that anyone actually reads this thing, keep this in mind: I'm no professional, just some nut who wants to be in shape some day.
Run 400 meters (sprint 200m, turn, sprint back)Rest precisely the time of the previous run8 x 400 completed: 1:12, 1:13, 1:15, 1:19, 1:20, 1:29, 1:25, 1:23
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