Does this pic look like you? There are several techniques to get over a wall in an obstacle race- here are a few:
The first method is my preferred way to get over walls, and the most efficient. I noticed it also being used in the crossfit games by the most efficient racers during the burpees with wall jumps.
Go up to the wall and jump while pulling yourself up to waist height. Then with your body against the wall proceed to roll over the wall with your stomach on top of the wall and your body becoming horizontal and parallel to the top. Then continue to roll over the top and to the other side while becoming vertical again.
Next up is more of a wall climb than jump, not very practical but I’ve seen some people use it. Jump up and grab the top of the wall with your hands, make sure you have a good grip. Once you are set, start to walk up the wall with your feet so that your butt will be sticking out eventually. When your legs are at about your waist level start to bend your knees more so that eventually your knees end up almost touching your chest. After your body is almost to the top extend one leg outwards and bring it over the wall similarly to the first technique. You will now be straddling the wall and can proceed down in the same manner or jump down depending on the height.
With either technique, you need shin guards, and XTGGEAR has designed BOXSOX to take the brunt of the first leg hitting the top of the wall. BOXSOX protect your shins, and the back of your legs from grazing. These stay up in any race conditions and are perfect obstacle racing protection for wall climbing, box jumps and deadlifts!