How Tight Should the Girth Be?

It is hard to tell when the girth is too tight but not impossible. Have you ever thought about the horse when you tighten the girth? Think about this when someone puts weight on your chest, what happens? Right, you have a harder time breathing. Now when the girth gets too tight the horse has a hard time breathing also. So to make sure that doesn't happen make sure you can fit two fingers to a hand between the girth and the horse.