TODAY'S London Marathon has already broken the record for money raised as it passes the £1billion mark.
Here's what you need to know about the event Prince Harry called the "biggest one-day fundraising event on the planet", what the route is, and how to watch the marathon.
Organisers say that about 42,000 runners are taking part in the “legendary 26.2mile challenge”.
They include “both the very best marathon runners in the world and thousands of first-timers who have been inspired to get active and raise money for charity.”
It includes elite runners - such as Britain's Mo Farah - as well as celebrities and the general public.
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Andy Murray, 31, the official starter of the event in 2019, said: “It’s an honour to be asked to start the London Marathon.
"It’s such an amazing race that means so much to so many people. It raises millions each year for charity and helps inspire people to get active.
"I have nothing but admiration for everyone who runs - I may even run it myself one day.”
The London Marathon starts from Blackheath in Lewisham and finishes on The Mall. All eyes will be on Mo Farah at the head of the elite field on April 28.
Runners will be hoping for a fine spring day to help them around the 26.2 mile course.