I looked up the detail as to what the COPD medical abbreviation stands for and found it is "chronic obstructive pulmonary disease".
I am puzzled as to why it impacts a person getting into and out of the Jazz - would someone please assist me in resolving this puzzle?
Thanks in advance
Muscles need oxygenated blood to work properly . If you have breathing efficiency problems or heart ,or circulation problems they may not get enough oxygenated blood to undertake any extra work.
Someone who may be young enough, fit enough or slim enough may not realise just how much muscle power is used to lower yourself into a low seat (in a controlled way) or haul yourself out again into a standing position.
Imagine if you were carrying a sleeping child or small adult? Would you have enough muscle power to lower yourself carefully onto a low couch, or get up again ,while ,still carrying them? How much easier it would be if you can perch your bum on a seat at about the same height and swivel your legs round.
Dont try it for real or you might strain your back and experience the problem some others have - muscle pain and flexibility issues.
edit.as a scientific experiment I have just measured my pulse at rest using a pulse oximeter. 61bpm. Then climbed some stairs and walked about a bit. Not a lot of effort but it went up to 71 bpm before dropping again. My body craved more oxygen.