And as their feet start to feel normal, their legs stop aching and they start to remember why signing up felt like a good plan in the first place, we’ve taken a look through our fantastic pictures of the runners in action. Every single one of you is inspirational – and here are just some of our favourite pictures which sum up just what the race, and the experience, is all about.
1. The costumes
Spectators - and runners - on the day get to clap eyes on so many incredible costumes. | JPIMedia Photo: Tim Richardson
2. Friendship
It's easier to get by with a little help from a friend! | JPIMedia Photo: Tim Richardson
3. Pride
Heading down the home stretch - the end is in sight! | JPIMedia Photo: Tim Richardson