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I'm 42, 6ft, 12st, run 4 miles every morning, at least 7 miles on a tuesday and a thursday night and around 15 on a sunday. I've built up to this over the last six months. Before that I was a little intermittent! I ran my first marathon in 2008 (3hr47min) and I've been running 5k, 10k and half marathon races when I can. Given all this, is it a realistic goal to attempt to train for a 3hr marathon?