Over the past couple of days we have highlighted a couple of locals taking part.
Dennis Rollings runs as it helps him cope with everyday stresses, including caring for his beloved wife, Wendy, who has Alzheimer's. Tomorrow he will tackle 100 miles.
Marama Christie couldn't run to her letterbox four years ago. Tomorrow she will run 62km.
And at the start line there will be hundreds more stories of inspiration just like theirs.
The elite athletes are undeniably incredible. They will seemingly cruise around the course and finish looking like it was a jog in the park.
But it's the everyday folk who impress me the most. The ones for whom the idea of running an ultramarathon must have once seemed just a pipe dream yet, through sheer determination and strength of will, they have got to this point. They are proof nothing is impossible if you set your mind to it.
They all deserve our support, Rotorua. So why not head out around the course or head down to the finish at the Government Gardens tomorrow to cheer them on?
Who knows, you may just get inspired.