Who is the best ultra marathon runner?

Determining the best ultramarathon runner can be subjective, but many consider Kilian Jornet to be among the top due to his remarkable achievements in various ultra distances and mountain races. His records in events like the Ultra-Trail du Mont-Blanc and numerous FKT (Fastest Known Time) accomplishments highlight his exceptional endurance and speed. Additionally, other notable ultrarunners like Jim Walmsley and Courtney Dauwalter have also made significant impacts in the sport, showcasing the depth of talent in the ultramarathon community.