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Hi There! I practice martial arts but am a relative beginner at long distance running. I recently ran my first race and furthest distance - 11.6 km. For over 90% of the race I was running at a hr of 165bpm or above. This is above 80% of my max. And this is at 7.5 minutes/ km!! But I could easily sprint at the end at 3 min/ km! I am 35 and about 10 kilos overweight, but I was not soar at all the next day and feel I could run faster...but I am afraid of exceeding my max for an extended period of time. Any advise or ideas as to why this happens and how I could improve would be greatly appreciated. My wife is a marathon runner and I would love to join her one day!!