Forcing Mudders to crawl under a deceptively heavy, water-filled liner, Birth Canal is as deceivingly tough as it is physically challenging. As Mudders pass through this obstacle, the water pushing down above them forces them to push back up and keep moving toward daylight.

There’s only one way out of this one, so start moving and don’t stop. Make yourself small by laying as flat as possible with your chest on the ground. Pull yourself along the canal with your arms to the outside and drive your feet against the wooden structure. If you stop midway, the water will settle and press you into the ground – so don’t stop pushing.