The 2014 UCI Track Cycling World Championships start in Cali, Colombia today.
Welsh riders Becky James, Owain Doull, Elinor Barker and Sam Harrison are all taking part in the competition, which runs until Sunday.
Unlike the Olympic Games the World Championships features a full programme of events including:
•Madison (men only)
Welsh Adventurer reveals the excruciating pain and agony she went through to cycle to the South PoleRead the full story ›
Cameras follow Welsh adventurer Maria Leijerstam as she bids to set a world record by cycling to the South Pole.
Wales This Week - The White Ice Cycle, Tuesday after News At Ten, on ITV Cymru Wales
An adventurer from the Vale of Glamorgan has achieved a world first by cycling to the South Pole from the edge of the continent in just 10 days. Maria Leijerstam managed the feat this Friday morning following a gruelling 500 mile ride in "vicious" conditions.
The 35-year-old set off from the Novo Russian air force base on December 16 and went head to head against two other male riders. Her team said at one point the sweat on the inside of her boots froze and she heated her freeze-dried food by melting snow on a small stove inside her wind blasted tent.
However, the former management consultant dug deep and pedalled her way into the record books while on a customised recumbent bike PolarCycle. Ms Leijerstam's mother Adrianne said her daughter's success was due to "meticulous planning, super fitness and pure determination".
Before setting out on her journey the extreme cyclist said: "I've had to get my body prepared for burning fat and not carbohydrates, so I've been training for two to three hours on an empty stomach which teaches my body to become more efficient."
It's Christmas Day but for Maria it means another hard day of cycling.
She's cycled 81km per day. On a continent where it never gets dark she has spent as little time as possible sleeping and maximum time she can cycling.
Maria is determined to reach the South Pole within the next three days.
In her blog yesterday she described the Antartica as vicious but beautiful.
You can follow Maria's journey here.
Welsh adventurer Maria Leijerstam is well ahead of her two male rivals in the race to claim a world first cycle title this Christmas.
Although Maria, 35, from the Vale of Glamorgan started days later and took a different route to the South Pole from the edge of the continent, her average of 40 km per day is putting her well in the running for a first.
With over 45kg of food and fuel, Maria started her journey started on 17th December.
After the first 80km she spent two days cycling up the Leverett glacier against very strong wind.
Fresh snow is making the task difficult and increasing the drag but she is continuing to travel 40-60 km per day.
She will spend both Christmas day and New Years day cycling in temperatures as low as minus 40 degrees with the aim of reaching the South Pole by 7th January 2014.
You can follow Maria's journey here.
An adventurer from Wales has set off on her latest dare devil trip which could see her achieve a world first. Maria Leijerstam from the Vale of Glamorgan is hoping to become the first person in the world to cycle to the South Pole from the edge of Antarctica.
She will spend Christmas day and New Year's day on a specially designed bike in temperatures as low as minus 40 degrees as Kevin Ashford reports.
Adventurer Maria Leijerstam, 35, is heading out to Antarctica in an attempt to become the first person in the world to cycle to the South Pole from the edge of the continent.
She will spend both Christmas day and New Years day cycling in temperatures as low as minus 40 degrees with the aim of reaching the South Pole by January 7 2014.
Four Welsh riders have been named in Great Britain's squad for the upcoming Track Cycling World Cup in Mexico.
Becky James will ride in the Women's Sprint while Elinor Barker will ride in the Women's endurance group. Owain Doull and Sam Harrison will ride in the men's endurance group.
Great Britain won eight medals at the opening round of the series in Manchester.
The World Cup in Manchester has given us a steady start to the season – we got some good results there and it also highlighted some aspects the team needs to work on.We’re keen to build on that in the next round and earn as many qualifying points for the world championships as we can so we’re sending a strong squad over to Mexico for the next round.