Local stores bullshit too, I was at a well known American ‘sporting goods’ store and got an exercise ball of 75cm size (it states on box), it is fully pumped and smaller than a 55cm ball that I have. When purchasing online I’ve had better luck
I have noticed the balls in my local dicks have occasionally been smaller than advertised as well, I wonder if there is some trend or fraud being perpetrated
Caveat emptor