As a mental performance coach in a soccer setting , I've seen how reinforcement shapes behavior. Positive reinforcement is the most effective. When I acknowledge a player during film for things like staying composed under pressure or making the right decision, they're more likely to repeat it. I've also seen negative reinforcement from some coaches where players increase effort to avoid mistakes or criticism but that usually doesn't build long term confidence or consistency. One example of shaping a mental skill is teaching a reset routine after mistakes. Instead of telling a player to "stay positive", I have them practice a simple routine like a breath, a cue work (like "next play"), and refocusing on positioning. Each time the tell me that they use it in training, I reinforce it right away. Over time, it seems to become automatic during games. This shows how a mental skill can be built though repetition and reinforcement, not just motivation.