Fill up the upper part of your lungs with air.

Watch! Right here at the top of the chest." Alf watched.

For that matter he seemed unable to remove his gaze from the splendid chest development that young Reade displayed so easily.

Then the boy tried to fill the upper portions of his own lungs in the same manner.

The attempt ended in a spasm of coughing.
"Fine, isn't it ?" queried Tom Reade, scornfully.