Which activity uses the "Elmsley count" and the "Hamman count"?

Elmsley count is a magician's sleight of hand to make it appear like the magician is counting the number of cards. The reality is the magician had set the deck before the trick even started. The Hamman Count on the other hand is a method of making it appear that the magician counted a different number of cards than they did, so more or less.

So the activity in question is deceiving viewers as to cards being counted fairly or accurately.

https://conjuror.community/the-elmsley-count/
https://en.wikipedia.org/wiki/John_Hamman

If you want to impress your friends, here's a tutorial for the Elmsley count

https://www.youtube.com/watch?v=vZTvL38tJhw

and one for the Hamman count

https://www.youtube.com/watch?v=hLPM5475lJU