Our life trajectory actually largely depends on our body posture. The core logic of this is quite simple but counterintuitive: we don't become confident first and then perform well, but rather we first "pose ourselves as confident," opening up our body and standing tall. The brain then gets activated, and emotions, hormones, and states are lifted together. In the end, we actually succeed and become truly confident. In other words, sometimes you think you're just pretending, but in fact you're using your body to reshape yourself in reverse.