To attain knowledge, add things every day. To attain wisdom, remove things every day. Sometimes when we practice meditation, there is a lot of doing going on and not enough being. One can get all tied up in the technique of the practice or the goal of it and lose the point.
Technique is important.
Slouching, wobbling, and shallow breathing are not conducive to meditation. Sitting still with an erect posture and breathing slowly and deeply into the abdomen are more conducive to clarity of mind, but good technique is not the goal. In fact, if you are sitting with a goal in mind, you are not being present. It s a paradox. We use technique, but the technique and goal are nothing.