Would appreciate an update and reference if you remember later.
Thanks.
It’s called the Pigeon stretch.
There are several ways to do it. I use the one where you lay on your back. You can also do it sitting in a chair.
At any rate, I have found it to be effective.
A good LMT recommended a number of stretching routines for different parts of the body. I have come to believe that 20 minutes in the morning of the proper stretching exercises is quite effective for a lot of aches.
I am 66 and do a lot of motorcycle riding. I think a good routine of stretching every day is one of the reasons I can still do hours on a bike. My zen. I dread the day when I can no longer ride.