Go someplace quiet where you will not be disturbed. Set a timer so you don’t have to worry about losing track of the time. (That’s the goal, actually!) Five minutes is fine to start. You can increase the time as you grow more experienced. Get into a comfortable position. (I have to do seated meditation—if I lie down, I fall asleep—but if you can do it lying down, that’s about the easiest pose there is.) Close your eyes and deliberately think about each part of your body in turn, relaxing anything that is tense or uncomfortable. When you feel comfortable, start to count your breaths. But don’t count above “one.” Just count one, one, one, over and over again with each exhalation. Don’t try to force yourself to breathe at any particular pace, or really suck in air for button-busting deep breaths. You should breathe a bit more deeply than usual and a bit more slowly, but don’t obsess over it. If your attention drifts, that’s okay, just bring it gently back to counting your breaths.
There. You now know everything I know about meditation. Go forth an achieve enlightenment.
Actually, I should add that you need to practice this. Believe it or not, it’s a skill. You may even feel like it’s pointless for the first several sessions, that your mind is jumping all over the place and you’re not “meditating” at all. But don’t be critical of yourself. Everyone’s attention wanders. That’s part of the process. Just gently bring it back each time. With practice, your mind wanders a little less (though it always will wander) and you’ll feel more relaxed at the end of the session. The super cool thing is that once you get better at it, if you’re feeling frazzled, wherever you are, you can just close your eyes and take some deep slow breaths and you can begin to draw forth that feeling of calm and focus.
Even practicing as rarely as once a week, but doing it consistently, can be beneficial. I feel like I’m a really sucky meditator, seriously, but I still find it a very helpful practice when I can’t schedule a full yoga session into my life.
And I totally agree with elelle that hatha yoga and mediation reinforce each other. IME, every yoga session includes some mediation. And as I mentioned, each meditation session really needs to begin with relaxing the physical body. Learning one contributes greatly to the other.