T.H.O.R. features more than 10 obstacles including cargo nets and mud pits.
Race day is Saturday, March 31.
It's an all-day event starting at 9 that morning.
T.H.O.R. is sponsored by the Leadership Wichita Falls Class of 2011 and benefits two deserving causes.
Clayton Hein, who's with Leadership Wichita Falls, says, "The proceeds go to the Women's Refuge. We're trying to build a playground for the kids out there. And also to the first responders in the area."
This weekend you have the chance to register before entry fees increase.
From noon til 4 Saturday, you can register for the run at Jerry's Sporting Goods, Academy Sports and Outdoors, and Sikes Senter Mall.
Representatives will also be at the Downtown Saint Patrick's Day Celebration from 4 p.m. til close.
The cost is $40.
Cash or check will be accepted at this weekend's registration.
The cost will increase to $50 Sunday.
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