Around week two or three of training, you'll think "I really don't got this." You still have a few more solid months of training left and you just can't remember why this felt like a good idea - but don't give up! You're already doing it and you've started your journey. If you didn't class yourself as a runner before, you're a runner now. You know what you're doing and you know what needs to be done, besides, there aren't a lot of things that will make you feel as good as stepping over a finish line of a marathon. Then you really will feel invincible.