From Helen Clifford, Fareham, Hampshire, UK
On the article “Your brain may determine how long you run for”, every runner knows that they are developing their brain just as much as exercising their body. At least 50 per cent of becoming a runner consists of retraining those brain circuits that tell you to stay in bed on a chilly morning rather than put on your trainers and get outside or to take the shortcut home rather than the extra distance you had planned. All sorts of strategies and tricks are necessary to strengthen this “determination muscle” (21 February, p 12).
