For me, the box was not an exercise to release the adrenaline. It usually happened to be on the floor in my messy garage or such and the only inanimate object for me to lash out at. Once I took the first kick, I would go ahead and finish the exercise.

I can see how a punching bag could be helpful for a youngster.

I did learn that I needed to learn to recognize when I was starting to get triggered. Often, it was that sense of "I am right and thus justified in getting angry." I realize that even if I was right about the situation, it did not justify my reaction to the conflict so I had to stop the behavior before it got rolling downhill.