It's a beautiful day in the capital, and our amazing #TeamPurple runners are getting ready to take on the Virgin Money London Marathon in aid of MS-UK.
They will be joining so many other dedicated charity supporters this morning, and at last count the event had raised collectively over £20,000,000 for charities!
So, why have our runners decided to get involved? Vic, from Essex, remembers watching her Dad run when she was a child. Now she's running in his footsteps, as he no longer can. Sue and Ellie-Rose are a mother and daughter team taking on the mighty 26.2 miles together. The Boland family are all in it together and have flown over from the USA to run today. So many reasons, but each one has been touched in some way by multiple sclerosis (MS).
All week we have been at the Expo event, meeting our runners and wishing them lots of luck.
Have a look at the messages of support, positivity and determination that they wrote on the MS-UK #TeamPurple runners wall in our Facebook album today!
For everyone running on 22 April 2018, whoever you're running for, good luck.
We'll be cheering you all on every step of the way!
You can follow MS-UK on Twitter to see marathon day live updates!