A 12 ft wall is among the obstacles to be overcome at the inaugural Assante Dirty Dash for Rebound Saturday morning at Canatara Park.
Proceeds go to various programs at Rebound Sarnia-Lambton.
Marketing Coordinator Jack Poirier says the response has been overwhelming, selling out in just over two weeks, with over 500 runners set to take part.
He says there's no doubt they'll get muddy.
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There are some spectator areas as well with water cannons.
The race begins at 10am, with heats scheduled throughout the morning.
