No, that is not the only core goal. Pranayama has many breathing exercises with many different goals. And cronopios is right: https://en.m.wikipedia.org/wiki/

No, that is not the only core goal. Pranayama has many breathing exercises with many different goals. And cronopios is right: https://en.m.wikipedia.org/wiki/Kumbhaka https://en.m.wikipedia.org/wiki/Kumbhaka