This exercise uses balance to engage the inner ear/vestibular system and the righting reflex in the brain. Which is well researched to help with autonomic control by stimulating the vagus nerve and inhibiting sympathetic dominance. This is probably the exercice that I recommend most to patients, especially those that struggle with anxiety/panic/ptsd, trouble sleeping from ANS imbalances or have experienced vestibular damage or head injury at any point in life. I find this exercise very regulating and often do it in times of acute activation or nervousness to bring immediate relief. I usually use a yoga block or practice balancing from the floor on one leg. If you have experienced vestibular or head injuries, please start from the floor. Exercise: using a yoga block or similar balance with one foot on the block/floor. Try balancing with your eyes open, then closed. Does it change your ability to sense your internal state while staying balanced? When you feel comfortable balancing in place, try shifting your weight forward and back upright to play with the righting reflex. Can you balance while in motion with your eyes closed? Are you able to track your breathing while focusing on your balance? After playing with this for some time, take a moment to stand with both feet on the ground and notice your internal state. Do you feel calmer? More grounded? Sturdier in your body or mind?