Over 1,000 runners took part in a marathon and half marathon at the Eden Project today.
But they didn't have too much time to enjoy the scenery, it's regarded as one of the most gruelling events in the UK. It's now in its sixth year.
Around 300 runners took part in the full 26.2-mile race. The half marathon had a much bigger turnout. First across the line in the half marathon was Paul Whear from Cornwall Athletic Club. He wasn't fazed by the terrain.