Watch the The Column of Air online guitar lesson by Karan Andrea from Guitar Player Wanted: Vocals A Plus
The second breathing concept I am going to cover, is the idea that you are controlling a column of air that starts at your groin, comes up through your body to your vocal cords, where it passes through the cords to make sound.
As this air is transferred to sound waves, those sound waves hit your resonating chambers and sound boards in your head to create what we hear as your singing voice. The 'support' part of breath support happens when you pull up from your groin to create solid support at the base of this column of air. The higher you go in your range, the longer the phrase you have to sing, or the more you work through your break, the more you have to support this column of air from your groin. So you keep your ribcage expanded, and gently pull up with your abdominal muscles.
Right now, you only need to understand this much, but if you start working your voice out, extending your range and asking more of your voice, you will need to work on your air management. This will keep you from running out of breath when you need it most. For now, I just want you to understand this basic idea.
It's very important to understand breath support with regard to your other instrument - the guitar. If you generally sit and play, you will want to make sure that this column of air is not kinked by your sitting position. It's best to use a chair that does not angle back at all because it's too easy to shift a little and slide back. This creases your stomach and cuts off your air support.
If you stand and play, you want to make sure that you can stand fairly square shouldered, at least when you are singing something that requires extra support - that is - in your break or head voice. Also deep chest voice requires surprising support to keep it from wobbling. You will want to avoid looking at your hands or pedal board. You don't have to look like a robot, although it may feel strange at first. Eventually you will learn ways to work correct posture into the way you present yourself as you play.