Throughout our daily lives, we tend to breath shallowly, hardly acknowledging that we have a breath. This is my first challenge to you: spend a few moments out of your day to check in with your breath. You could simply notice your natural breath or you could spend a few minutes concentrating on deepening the inhale and lengthening the exhale through the nose. Simply be aware. A good time to exercise the breath may be in your idle time; perhaps when you are laying in bed in the morning or at night, while you are driving, while in the shower, etc. Whatever works for you!
A fun and energizing pranayama to practice is the "breath of joy." This breath is great to use first thing in the morning to really wake you up or when you are feeling somewhat lethargic.
It goes like this:
Standing in mountain pose inhale the arms up above the head, inhale the arms out to the side, inhale the arms back above the head and then exhale drop the arms towards the floor. You can add an energized "ha" to the exhale if you wish.
Each inhale is a small sip of air and the exhale can be long and loud. Don't be afraid to move the arms energetically.
This exercise will get your blood pumping and your heart rate thumping. If at any point you feel light headed or dizzy or if you know you have uncontrolled high blood pressure please refrain from practicing this breath.