It's mid-April - it must be Marathon time! For all the runners who'll be lining up on Blackheath tomorrow for the Virgin Money London Marathonall the hard work has been done, right? Wrong! Through my ten years as an elite athlete, I learnt that the final few things you do before race day can make a big difference to how you perform. So, what are those crucial things that will help to make your 26.2 mile journey a successful and enjoyable one?