How do I reduce the 'body' text area size on initial page load up

At present the 'body' text area is a little too big for my liking. I am of course aware that you can drag the bar at the bottom to increase/decrease the size however I am trying to reduce the size it is viewed at when a user first sees the page. I know with other modules e.g. cck (adding a text area field) that in settings you can chose the size of the text area so I doubt this is difficult to implement here too. I am unable to find it in the code however

I would appreciate it if someone could point it out

Thanks