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I entered my first marathon which is the last week in October, I took the advise giving to start a 18 wk marathon plan. I have being going quiet until now. Yesterday I found it a strugle to complete 5 miles. Monday and Tuesday I felt great but yesterday I found my legs extremely tired / weak. I am doing my long runs on saturdays and am a bit apprehensive now as I have 12 miles to do this week. What can I do to help strenghten my legs. (or will they just strenghten as the miles increase) any advise is appreciated.