On the tradition of striking breast during confession of sin

Is it obligated in Catholic or Orthodox churches to strike one's breast while making confession, during Mass and/or sacrament of Confession? How old is this tradition? When is its earliest documented practice? This picture shows an example of what I mean (notice the fist over the heart): There is also [a short Instagram video](https://www.instagram.com/cardinaltimothymdolan/reel/CxnhHpeL1SZ/) (of Cardinal Timothy Dolan), showing the meaning and how it is done.