I’ve gotten a bit overweight. I can’t count the number of times someone has simply let all the air out of the cuff way too fast to get a reading, and given me a high-pressure reading. I’ll demand a slower, more attentive reading, and by BP will drop from 150/110 to 120/80.
I can swing over 35 points from instantly sitting down, to calmly waiting just two more minutes, with good posture and a few deep breaths, so from 150 to 115.