BROOKLYN, MI - Ten days from now, Michigan International Speedway will transform into a grueling, muddy obstacle course.

Michigan's first-ever Spartan Race is slated for Sept. 9-10 at MIS. It's shaping up to be a good one, said Dan Soleau, Spartan Race director of race planning.

Nearly 6,400 people were registered for as of Tuesday, Aug. 29, Soleau said. Registration is available online or at MIS the day of the event.

Spartan Race courses vary depending on where the race is being run, Soleau said.

Generally, participants are tasked with overcoming obstacles like crawling under barbwire, sloshing through muddy water, carrying heavy objects, jumping through fire, climbing up and over walls and more.

MIS offers opportunities for a unique course, Soleau said.

Two different types of adult races are taking place at MIS - the eight-mile "super" and the five-mile "sprint."

Both races are on the "heavier side" when it comes to the number of obstacles on them, Soleau said. The "super" features 28 obstacles. The "sprint" features 23.

Ten of those obstacles are used in both races, Soleau said. These 10 obstacles are in the infield of the racetrack where the start and finish line is located, he said.

The course also utilizes other parts of the racetrack, including the tunnels and grandstands, Soleau said.

A special quarter-mile dash challenge is being done on the racetrack's backstretch, Soleau said. A condensed kids race is also available.

The Spartan Race replaces the Tough Mudder Mud Run, which was at MIS the past four years. This year's Tough Mudder in Michigan was moved to Oxford.

The goal of the Spartan Race is to encourage participants to adopt active lifestyles all year -- not just the day of the race, said Roger Mast, race director.

"The idea is if we can get you off the couch, we're doing our job," Mast said. "We think it's a quickly rewarding endeavor. If we can get you out here, we think we'll keep you coming."