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I know I can easily run an 8 min mile , I have spent the last 3 months doing interval training , mile reps , fartleks, track work . in my mile reps I run at 720-730 m/mile pace. Ran 2 marathons last yr so have the endurance but every 10 k I do I seem to give up , slow down and give the race away. Why ? Anyone else experience this ? So annoyed with myself .