What a day in the sunshine at the Virgin London Marathon. It has been a moment for everyone to support each other and celebrate human achievement.
I must admit I would love to have been out there taking part in the race rather than cheering the runners on. Nevertheless, the next best thing is getting to see all of the overwhelmed runners finishing the race.
It felt like the biggest, loudest, most supportive Virgin London Marathon crowd so far, with everyone coming out into the streets of London in a show of solidarity for all of those affected in Boston, as well as those running their hearts out today.
BBC commentator Brendan Foster summed it up well this morning: "In the early stages, people's thoughts will be on Boston, but later it will be business as usual. It wasn't an attack on running, it was an attack on humanity and humanity, led by London, will respond to that."
One sign - spotted by marathon legend Tanni Grey-Thompson - that stood out echoed the thoughts of everybody present on this special day: "Run if you can, walk if you must, but finish for Boston."
Standing at the finishing line shaking thousands of runners' hands was an absolute joy. There were lots of hugs, handshakes, photos and fist bumps with sweaty, happy people. Records were broken, hilarious outfits were worn. One man even proposed - she said yes!
Everyone kept asking when I will run the race again. The day I ran the Virgin London Marathon was one of the best of my life - so never say never!
Earlier there was a thrilling sprint finish to the Men's Elite Race, where one of the finest marathon fields ever assembled didn't disappoint. Prince Harry and I were lucky enough to hand out medals to the winners of the Wheelchair Marathons too.
Hats off to all of the organisers who worked so hard to ensure everyone had a safe and enjoyable day. See you next year!