I began feeling a pain in the butt/upper hamstring after yesterday's run, and decided to skip the speed work in favor of XT today. I think it was brought on by my two speed workouts last week on the treadmill where I felt my form go down the gurgler. I know I overstride on the treadmill, and don't seem to do well at keeping up a good cadence at higher speeds. XT: elliptical intervals: 45 mins + some light strength / core work.
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