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i am an ex triathlete completed an ironman could do around 36 mins for a 10k then discovered sex drugs and rock and roll but always ran. that was a long time ago i am 51 and i struggle to do a 50 min 10 k. i run quite fresh at the weekend but during the week after work i more than often have to walk home after a couple of miles. whats happened and can i improve, thanks in anticipation