Sit in a comfortable seated position and tune into your breath. Allow your breath to slow and deepen. Meditate on the word "yoga" or "union" or "one." What associations do you have with those words? What do they mean to you?
Now move away from your thoughts and simply sit with your concentration on the word "yoga." If thoughts intrude, notice without judgment that your mind is chattering, and return your focus to your breath. You are moving into a direct experience of what union truly means.