Here is my rule for injury prevention:
Pain or discomfort of level 2/10 (on a scale of 1-10 where 10 is maximum pain) is the maximum allowable pain level where running may continue.
If the pain is 2 or less AND remains steady or decreases, running may continue.
If the pain is above 2 AND/OR is increasing, running must be stopped immediately. Not after the workout. Not after the run. Just stop.
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