breathe heavily

Del Norte was beginning to breathe heavily from his exertions.

Faster and faster ran Pierson, and soon he was rather gratified to hear Frank beginning to breathe heavily.

He had already begun to breathe heavily, and he paused for breath.

But the other knight seemed to be unharmed, and never seemed to breathe heavily.

At this retort, reflecting as it did upon the management, Black Tex began to breathe heavily and sway upon his feet.