Deep breathing gives you so much more physical energy that you won't be able to sit around and moan about your tight clothes, your low metabolism, your . . . (fill in your excuse of choice). When you start breathing properly, you'll have so much more energy that you'll feel like dancing; maybe even starting that painting project you've been putting off. Who knows, maybe you'll ride a mountain bike over Pikes Peak. Whatever those long lost goals, you'll suddenly find the energy and stamina to complete them. You'll find yourself springing out of the bed in the morning, excited about life. When your cells don't get enough oxygen, they don't have the fuel to slough off toxins. And since this is one of their major jobs, they get bogged down and tired. They inefficiently spin their wheels, using what little fuel is available to keep trying. That's one thing you can say about your cells - they certainly don't give up easily. It's just that without the proper oxygen, their efforts to get rid of cellular pollution are futile. They're in a perpetual state of distress, which perpetually sucks your energy. Remember, you are only as healthy as your cells. The good news is that by simply supplying them with an ample supply of oxygen, their job of removing toxic wastes is a piece of cake. And there's plenty of energy left over for you.
The other thing you'll notice when you start breathing properly is your energy level will be more consistent. You won't have those bursts of energy in the morning and then feel like sneaking into the bathroom for a snooze after lunch. Your energy will remain steady.