"Running the famous track will be a truly amazing and inspiring experience."
Winson said there was no doubt it is a tough run but with careful management very achievable to most.
"A lot of it is mental as it has all the elements: ups, downs, flats, sealed road, off road and beautiful scenery. It is definitely not a boring run."
Turner Williams, who has a background in recreational horse riding, is making her marathon debut.
"This may be my only marathon. If it is, I want to do the toughest and hardest one out there. Daunting, yes, but I can't wait.
"Running became a bigger part of my life as I approached 40. A bad back limited my ability to ride my horse and eventually forced me out of my hobby. A desire to lose a few kilos also got me running more. I started to run more regularly and began wondering how much I could achieve and I decided to find out.
"I saw articles about the event over the past few years and I decided that I would do it as part of a self-motivated challenge for my 40th year."
She is expecting four results from the course: pain, tired legs, blisters and aching joints. Turner Williams had a training programme compiled by Jon Ackland at Performance Lab.
"The first training run was at the end of March and was a 30-minute easy run in the pouring rain, and I wondered what I had signed up for. Tomorrow I am doing 36km of hills ... and will wonder what I have signed up for. There have lots of miles in between."