If your body is painful, stiff, or generally uncomfortable, it can be difficult to sit in meditation. Regular asana, especially hip opening poses like butterfly, will make room for openness and suppleness in your body. Suddenly sitting in meditation becomes easier, and eventually comfortable.
Butterfly pose is held for 1 to 5 minutes, so it is a great preparation for meditation. While sitting in the stillness of this pose, you become more aware of your breath. You can see your mind, including any desire to back away or push harder into the pose, and choose to turn away from that desire and stay present. And in the solitude of your time in butterfly, you can experience a sense of calm. This is what you need to cultivate to stay with a meditation practice and discover the true meaning of Yoga.