Please can someone help with some advice, i did my first ever half marathon last year in Bath, i was happy with 1hr 47 mins, i also did the Bristol 13 miler 6 months later, and again achieved 1hr 47 mins - i actually beat my first time by around 12 seconds - my question is, HOW DO I IMPROVE ON THIS? - i would love to do another one and finish below 1hr 40, but i can`t see how i can!, The trouble is that i seem to have just one speed which is comfortable to me, i run the same for the last few miles as i do for the first few- so i am very consistant. But how do i make the next step up? (without killing myself). Thanks for reading.