Ben Smith from Portishead, who previously completed 401 marathons in 401 days, has announced his next challenge to run a marathon in every US state capital.
Ben, who used to be unable to "run for a bus", completed an epic marathon challenge in 2015-16 and was named ITV Fundraiser of the Year at the Pride of Britain Awards in 2016.
He raised more than £330,000 for anti-bullying charities.
His next challenge will not only see him running a marathon in each of the 50 US state capitals - he'll also cycle between each location.
The USA 2020 Challenge, which will cover a total of 18,500 miles in 104 days, will support mental health causes throughout the UK.
Throughout the adventure, Ben will average 177 miles a day, scaling the equivalent of nine Mount Everests in total. He hopes to raise one million pounds for two charities.
The 401 Challenge will now raise the funds needed to cover the cost of the adventure. To find out more, click here.