Olympic great Mo Farah is aiming to conquer the marathon after finishing his decorated track career next year.
Farah won gold in the men's 5000 metres and 10,000m in both London in 2012 and Rio de Janeiro earlier this year.
Speaking exclusively to Omnisport, the 33-year-old reiterated his intention is to move away from track competition after the next World Championships on home soil.
"My last year on the track will be 2017 in London," Farah said.
"After that I'd like to be able to go to the road, [to] experience and to learn about the marathon. When I did the London Marathon I struggled a bit, let's be honest," he added, referring to an eighth-place finish on his marathon debut in 2014.
"It was hard work. It's more [about] understanding and learning about the event.
"I'm very honoured to have been able to have the career I've had. To have achieved what I've achieved for my country and for my family. It hasn't quite sunk in yet. I just want to continue while I can and keep going.
"But at some point I will have to planning ahead about what I'm going to do when I'm done.
"I've been involved in the sport since I was the age of 12, I'm almost 34 now. It's not like I'm going to continue for another 10 years, 15 years.
"I think it's probably in the next three or four years I'll probably have to call it a day."
While Farah intends to switch focus, Jamaican superstar Usain Bolt will retire entirely after returning to London for the World Championships next year.
Farah, who struck up a friendship with the sprinter during their time together in the spotlight, believes the nine-time Olympic gold medallist deserves all the plaudits that come his way.
"I think we owe him, not just in athletics," he said.
"All sports owe him a lot. How he does it is incredible, triple gold, coming out [and winning] year after year. [He is] an inspiration to so many people."
Farah meanwhile is proud of his status as one of Britain's most successful competitors.
"It's amazing... to be associated with some of the great sportsmen in this country," he said.
"We've had so many great athletes in the past like Steve Redgrave and so many beyond that. To be in the same category as them is amazing and something I never dreamed of."
**Mo Farah: No Easy Mile is available on DVD and digital download now.**