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I did cautious walk/run intervals on the treadmill at the gym this morning. (Trying to work my way up to jogging 5K.) My intervals were 1:15 brisk walk, 0:45 jog x 10 repetitions. Went OK, no pain. For reference, cardio health is OK because I do brisk walks, elliptical and stairclimber for about 4-5 hours per week. I have used the Podrunner 5K, 8K and 10K podcast series in past go-rounds, but I tend to get shin splints.