I did the Sharon Salzberg meditation challenge a few years ago. It was nice – I was just starting to get into meditation. I had no idea how powerful it could be and I continue a meditation practice. It is definitely a practice because it is never perfect and ebbs and flows, much like my life.
Particularly in step 2 observing the body I got focused on the not quite pain but unpleasant uncomfortable feeling in my right knee. That’s just how it is right now.