It means there's a hole in the side of your chest and it's sucking air in.
According to the Department of Motor Vehicles, for safety in the event of an accident, you should adjust the seat of your vehicle so that your chest is 10-12 inches away from your airbag and steering...
no, that kills people.
LEFT
Whenever you need one...not just at random.
Parallel Arm Chest Stretch Exercise
Partner Assisted Chest Stretch Exercise
Above Head Chest Stretch Exercise
Chest Congestion Remedies for Kids