The Grand National takes place this Saturday, and will be watched by tens of millions of people across the world.
But the 2013 winning jockey, Ryan Mania from Galashiels, has given it all up for a new career.
Evanna Holland's been to meet him to talk about life after racing, and find out who he'll be backing in the big race.
The jockey Ryan Mania has announced his retirement with immediate effect, because of weight struggles.
The 25-year-old from Galashiels in the Scottish Borders said he had been struggling for some time to keep his weight down below the accepted limit for races.
It is only eighteen months since he won the Grand National steeplechase on Aurora's Encore.
Large crowds are expected at Carlisle Racecourse today where one of the world's most successful jockeys is riding.
Champion jockey Tony McCoy will be riding in five races including on Cheltenham Gold Cup favourite Holywell.
The day is the richest in the racecourse's calendar with prize money of £90,000.
Other jockeys racing today include Ryan Mania from Galashiels who won the Grand National in 2013.
Grand National winning jockey Ryan Mania hopes to repeat last year's victory at Aintree, but this time with a different horse.
At the weekend, the Galashiels rider tested out his new mount Mr Moonshine at Kelso Racecourse.
Mania's ride was the big talking point on the track's richest day of the year, as Jenny Longden reports.
Last year's Grand National winner Ryan Mania came second at Kelso yesterday, on the horse he'll ride at Aintree this year.
The Lindean-based jockey came second on Mr Moonshine.
He was due to ride Auroras Encore again in this year's Grand National, but injury has meant the horse will not race.
Grand National winning jockey Ryan Mania has been trying out the horse he will ride at Aintree this year.
The Lindean based jockey came second on Mr Moonshine in the Premier Chase at Kelso Racecourse.
Mania had planned to ride at Aintree on Auroras Encore, the horse he stormed to victory on at last years Grand National, but injury meant Auroras had to be retired.
Mania now plans to compete on Mr Moonshine, another horse trained by Sue and Harvey Smith.
He will ride in the same blue and yellow colours he won in last year.
This year's Grand National winning jockey Ryan Mania has been taking part in the Braw Lads Gathering in Galashiels.
The 23-year-old, who romped to victory on Auroras Encore in the famous race at Aintree, was also Braw Lad during last year's event.
He said: "I stood here last year thinking, I made a speech saying the only thing that would top being Braw Lad would be to win the Grand National and then I went and done it!"
Grand National winning jockey Ryan Mania says it's almost impossible to scoop a double National win. But the Galashiels jockey told us exclusively he will keep on trying, after he failed to finish in yesterday's Scottish Grand National. Watch Jenny Longden's full report: