YSK that meditation/mindfulness is a branch of yoga, not a separate discipline from yoga.
Why YSK: In North America when we think of yoga we often think of postures and stretches done on a mat. The proper name for this activity is Hatha Yoga. The Sanskrit name for the practice of meditation is Dhyana Yoga. The simplest definition of yoga is “a wide variety of techniques to answer the question “Who am I?””.
With the right attitude and understanding many activities, such as going for a walk, archery, ballroom dancing, drawing, mathematics and cooking (to name just a few) can all be used to practice yoga. Some types of yoga however, help to prepare the body and mind for other types of yoga. Understanding how different types of yoga compliment each other and the proper order to practice certain types of yoga can both solve many problems you may experience and give you the best opportunity to reap the full benefits from your practice.
The ancient teachers of India realized that individuals come to the practice of Yoga with a variety of personality types, preferences and physical limitations. They also realized that while some types of yoga may be best suited to some individuals, these same types of yoga may not be suitable (or should be adapted) for others. They also realized that while a wide variety of activities can be used to practice yoga, some activities were so useful it was recommended that anyone practicing yoga should at a minimum try these activities.
Meditation is considered an advanced practice of yoga. The ancient teachers recommended several types of yoga to prepare the body and mind for meditation. Hatha Yoga in all its varied forms was one of these recommendations. Pranayama, the practice of breath control has a wide variety of benefits and was another recommendation.
If meditation is your chosen practice and you aren’t practicing Hatha Yoga or Pranayama you should give them a try!
This link is to one of the most cited texts in the study of yoga. Patanjali's Yoga Sutras written in circa 400 CE: