Looking for a new challenge, Mark Walford took on a 24 hour triathlon challenge with a difference to raise funds for Alzheimer’s Research UK.

It was a mix of short and long-course racing this weekend, as Supertri returned in Chicago and Leeds held its first ever IRONMAN event in the city.

More than 50,000 people will complete an IRONMAN this year, but do you know what is involved in doing one?