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I have been running since last October, I do 5-7k about 3 or 4 times a week. Im just a bit concerned as I seem to have put on nearly a stone since i started! Dont get me wrong, i was underweight and needed to put on weight but im worried that i will continue to get heavier! i know of the saying 'muscle weighs more than fat' and I have noticed that my thighs & bum etc are more toned but does muscle really weigh that much and if it does would i have toned up that much in 8 months? p.s. my diet is fairly healthy so I dont think its due to a bad diet!