I’ve taken up Yoga a couple of months ago and enjoy it quite a bit, although it’s definitely more intense than I expected. Now, in some positions, I feel (and hear) a very clear cracking sound in my upper back. What happens then ? Is it comparable to cracking your knuckles, from a “mechanical” point of view ?
On the whole, it feels really good, but the initial impression is surprise, followed by a sharp but very brief pain and only then relief.
Or it could be that as you stretch and twist and assume whatever position causes this, you are in fact adjusting your spine. Not uncommon in my experience, i know several people who do that just by twisting their upper back a bit. Heck, I’ve done to myself now and then, and yes, the sensation is as you describe.