I can't summarize the real goal of yoga properly (meditation is one of the important exercise beside contemplation; the asanas are for preparation only), but it's more to be able to let go of the selfish desires like becoming smarter, getting a sexier body, getting more money, fame, admiring ("Oh, you look so good lately" ... "Yes, you know, I'm doing yoga."). The goal is more to be able to coordinate (not suppress) the desires to avoid doing harm and at the end creating harm for yourself. Meditation gives us insight to where the desires are coming from. Are they essential? Do I need to fullfil them? Or do I need to eat another snickers just because the last one has made my blood sugar go like a rollercoaster?