Meditation and yoga go hand-in-hand. Outside of the meditative state, yoga is simply gymnastics or calisthenics. Of course, it's nearly impossible to force yourself in to a deep, relaxed state on cue. That's why we use pranayama (breath awareness and sometimes control), especially as novice meditators, newbies on the spiritual path.
Right now, take three deep, complete breaths. Inhale fully, filling even the lower lungs, and relax your abdominal muscles. Let your exhale be passive, in other words don't push it out or try to lengthen it unnaturally. Already after just a few breaths using this method, you may feel calmer and more centered. Imagine breathing this way for an hour-long yoga or meditation session. Or all the time!
The breathing techniques used in yoga teach our bodies to breathe more deeply as a habit -- even outside our formal "yoga practice." Without even thinking about it, we may begin to sigh or breathe more deeply throughout the day or at the office. Learning to breathe in this way, with acute awareness of the breath and a pervading sense of gratitude for each inhale and exhale, can truly transform your attitude and overall sense of well-being.
metta