This is a guest post by Shaun Dixon, who is an elite runner and head coach at Let’s Get Running. A self diagnosed ‘run-addict’, he uses his experience of training and competing over a range of distances to coach runners of all ability levels. Shaun is training me for the 2017 London Marathon. Thinking of tackling your first Marathon? Here are 5 tips to read before you kick off your training. 1. Be patient. Don’t take on too much too…