What is best sitting position to help w/breathing if I have COPD emphysema?

Maximize lift. Leaning slightly forward, palms resting on the knees, head slightly bent, lips pursed, fast breath in, slow and prolonged exhaling. The goal is to get the respiratory muscles including neck muscles, in the best position for maximal lift, and empty out the lungs as much as possible to make room for more air coming in.
Sitting and. Sitting and stooping forward over a pillow --- is the comfortable position for a COPD exacerbation.