You are at a party and make a statement. Someone disagrees with you and you feel small. There is no time to get to the bottom of why you feel small - the chain of symptoms is to long, so you have another drink and “forget about it” until later. Later, with your sweetie, you mention what happened at the party and the emotion percolates again to the surface. Your sweetie says something like “Well, you are awesome and so and so is an idiot anyway...." and you feel better. For now.
What has happened is a chain of suppression. You would have liked to have been valued and agreed with but instead the opposite happened. The energy from that experience was then stored in the tissues of the body via a process of first thought - light and changeable - becoming emotion - more physical and felt for longer - and finally the body - some perhaps almost invisible, contraction.
Then you practice hatha yoga and all parts of the body - at ease and contracted bits - are pulling and pushing together, and the contracted bits that holds the energy of your exchange at the party are now supported - really supported- by all your other bits and the emotion is released. You laugh at yourself, or cry. Either way, the contraction is squeezed out and you rest after your practice.
It is a simple and amazing process. When you go to a party next time and someone disagrees with you, you can watch the process happen. No need to change it.