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On Sunday, over 42,000 runners will get ready, set and go at the start line in Blackheath as Sir Andy Murray officially starts the 2019 London Marathon.
Many will be facing the 26.2 mile route for the first time, while for others, its chance to break their personal best.
One inspirational runner we spoke to was Dave Heely. A blind runner.
As a child, Dave was diagnosed with an eye complaint called retinitis pigmentosa. Over the years he gradually lost his sight, but that hasn't stopped the 61-year-old from West Bromwich doing what he loves - running and raising money. In fact Dave loves running so much that in 2016 he completed an astonishing seven marathons in seven days across seven continents.
"I don't care whether you're disabled or not, running is about improving your mental well being and getting yourself out there. It's great for your inner self - for me, it just makes me feel so wonderful.
"Being blind, I do need a guide runner and I have a selection that I've built up over the years. My main guide runner is Tony. He's brilliant. He has a 40-minute drive each morning and knocks on my door at six o'clock for our 10-mile run, but he says if he didn't have to do that he wouldn't be out running, so we both help each other out in that respect.
"During the run, we'll always be talking, discussing the news, what we've been up to. During the marathon, I'm looking forward to us having a sing-song and Tony will keep me updated on the sights around."
