ANDREW Robinson is one of the fastest sprinters in the country, but confessed the 10-kilometre Ross Marathons event this weekend will be a struggle.
The 20-year-old Stawell Gift winner, of Riverside, is one of 715 people who will compete in one of the four charity races on Sunday.
Races include a marathon, a half marathon, a 10km event and a 2km children's fun run.
It will be the first time Robinson has taken on the 10km challenge and he is not sure how he will go.
``Anything out of 60 seconds is out of my comfort zone,'' the sprinter said.
``I'll be on struggle street probably two kilometres in.
``But since Stawell I've been trying to find different ways of keeping fit, so I'm making it a new challenge for myself.
``It's also a great opportunity to support a good local event.''
The day is co-ordinated by Casey Mainsbridge and his committee.
Mainsbridge said he had been overwhelmed with the number of entries from around the world this year.
``We had just over 600 last year, but that included on-the-day entries,'' he said.
``So it's surprised me a bit.''
Mainsbridge said entries would be accepted on Sunday, but the committee could only manage about 800 participants, so it would be ``first in, best dressed''.
The day will raise funds for the Prostate Cancer Foundation, the Ross Sports Community Group and youth suicide prevention organisation Time Out House.