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I started training in March for the Bristol Half Maarthon which is 3 weeks away now. The last 2 out of 3 runs have been a real effort. On Friday I went out for a 10 mile run which was ok but I attempted another 10 miler today & had to turn around as I had no endurance or stamina at all & felt really hot! Another run last week was also a real effort & my legs felt really heavy & I was slow & sluggish. Do you have ANY advice or ideas as to why this may be? I have been trying to stay hydrated etc. I cant get my speed up at all - not even for a fartlek/interval.