Think of it this way, let's say you drop your keys in the snow. You can't find them because they're buried. But what if you had a giant heat lamp at your disposal...you could melt the snow, and there are your keys.
Somatic tracking is like the heat lamp of your body, and your anxiety is the snow that's keeping your emotions buried. As you attend to your sensations, you're able to regulate your anxiety, and you can get to the emotions underneath.
By the way, it hasn't snowed in Los Angeles since 1987 so I really had to reach for that analogy.