BEing limber and flexible is something you develop over time. THe good thing about yoga is that you don't have to be as good as everyone else in the class- do what you can do. ANd it is more strenuous than it looks and not as easy as it looks! I find it's good for things like my back and neck, where I get stiff and sore, and also it is relaxing. It helped me after I had surgery last year and had to get limbered up after weeks of being immobile.
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You can catch more flies with honey than with vinegar. That's great...if you want to attract vermin.