Getting high-centered on your belly or axles is one of the most common ways to get stuck. Stack rocks, wood, or other trail debris under your tires to grab some traction. A Hi-Lift jack under the bumper usually is enough to make the difference. Letting some air out of your tires can also help, but don’t go too low or you’ll just plant yourself more firmly into the obstacle. Finally, if rocks and wood keep shooting out from under your tire, remove your spare and lay it down for traction. The rubber on your spare’s sidewalls will provide better friction on the ground than rocks and wood and shouldn’t shoot out as your Jeep tries to climb up it.