Rockzmom, thanks very much. It’s clear now.
Usually my blood pressure 120/70 and I often hear in medical station: “[You are] like cosmonaut”, that means “perfect”. On the other hand I did not know 80/50 is norm for sportsman. That’s why I thought Roxy’s “world athletes” and Russian “cosmonaut” are equal, and Roxy’s words mean “mom blood pressure are perfect, too perfect” (usually people are not ideal). I know Americans use foot and inch, for example, so my first thought was “may be, they use other units for blood pressure too”.