1st QUESTION: What is the main objective of inhalation in the costo-diaphragmatic breathing described?

Elevating shoulders and chest to expand the rib cage
Inflating only the upper thorax rapidly
Holding your breath until you feel tension in the neck
Directing the air towards the umbilical region to expand the abdomen while keeping the chest immobile

2nd QUESTION: Where should the hands be placed during the proprioception exercise?

Allows whispering speech without using the diaphragm
Makes it easy to abruptly cut off sentences
Avoid tremors and voice drops, maintaining stable volume without laryngeal effort
Increase throat vibration for more brightness

Directing the air to the abdomen with 3D expansion without elevating shoulders, and dosing with a constant "S" while the abdominal wall pushes gradually
Breathing in through the mouth to fill quickly and exhaling without resistance
Expanding only the chest on inhalation and relaxing the abdomen on exhalation
Raising shoulders when inhaling and tensing the larynx to project