The infamous and dreaded treadmill fartlek
two minutes at 7 mph, two at 8 mph, two at 9 mph, four at 10 mph. Continue this for 60 minutes increasing the speed .1 every ten minutes. So the last ten minutes were 7.5, 8.5, 9.5, 10.5 mph. Completed this workout with little distress. Good sign.
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