More than 12,500 people took part in the Brighton Marathon earlier in "glorious sunshine", organisers have said.
Now in its 15th year, Sunday's race started in Preston Park at 09:45 BST, with the finish line at Hove Lawns.
The Brighton & Hove 10K (6.2 miles) event was also being held on Sunday.
The men's race was won by Sam Cook, from Horsham, who completed the race in two hours, 26 minutes and 47 seconds, while the women's race was won by Helen Reid in two hours and 53 minutes.
Mr Cook described his victory as "unexpected", adding: "It was hard out there with the wind.
"But the crowd all the way round kept me going. You never know how far back the guys are behind, they were on my heels, I think."
Winning her second Brighton women's race after victory two years ago, Ms Reid said the support was "incredible".
"Around 35k, it started getting a bit rough and I slowed down a bit," she said, adding: "But the crowd really carried me through, the support is so amazing.
"I don't think it's started hurting yet, it hasn't sunk in, but I'm sure my thighs will be telling me something tomorrow morning."
Best friends Grace and Amy told Radio Sussex that running alongside each other would get them through the event.
Simon Nichols was running his second Brighton Marathon, having first taken part 10 years ago.
He said: "I've tried triathlon, I've tried cycling, I've tried swimming and I've come back to running in the last year.
"You can always run one minute further, every time you feel like stopping you can always do another minute. Don't think about the finish, it's too far away."
