Rate and Rhythm (see the Respiratory Rate page).
Observe chest wall and rib movements.
Signs of distress, noisy, use of accessory muscles.
Note the relative time duration of inspiration/expiration, airway obstruction= prolonged expiration.

FET Maneuver: Normal person empty his/her lungs in 3 seconds or less.

Thoracic respiration (erect position)
Abdominal respiration (supine)