Tears on your yoga mat

This morning, while I was doing yoga (Yoga for the Warrior with Bob Harper), and at one point, he said something about letting it go, and just focusing on that pose at that moment, and right then and there, I started to cry -- like real tears, running down my cheeks. I don't know what it is about exercise, but it makes me emotional. Maybe it's because there are some emotions and thoughts that I tend to bottle up at times and pushing my body to limits makes me so vulnerable that it all comes out. I'm not sure.
But am I the only one?

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