I've known that the mind can be affected by the body's actions, but I often forget this when sitting at my computer chair for long stretches, and when standing and interacting in social situations I've subconciously cultivated a passive, non-confrontational but minimally interactive posture. But simple physical actions can act as a mild nootropic for certain situations.
Article with citations: 10 Simple Postures that Boost Performance
Article summary:
1. Take a powerful pose to feel powerful
2. Tense muscles for willpower
3. Cross arms for persistence
4. Lie down for insight
5. Nap for cognitive performance, vigour and wakefulness
6. Hand gestures for persuasion
7. Gesture to self for comprehension and memory
8. Smile for happiness
9. Mimic to empathize
10. Imitate for comprehension and prediction
Overall the concept of embodied cognition makes a lot of sense. Yoga and particularly martial arts give a lot of tools for embodied cognition. Particularly martial arts - these are all telegraphed gestures, in an adversarial mode it's not useful to advertise weaknesses. Changing weight balance and the subtle foot motions involved in shifting into a martial arts stance is less obvious and communicates strength to anyone able to notice.