puff and pant
To breathe very heavily or laboriously. He sat puffing and panting for several minutes after sprinting to catch the bus. You really should quit smoking—look at how you're puffing and panting after a single flight of stairs!
ˌpuff and ˈpant/ˈblow
(informal) breathe quickly and loudly through your mouth after physical effort: Eventually, puffing and panting, he arrived at the gate.