A somewhat unnecessary skill, that said if you’ve got 200 eggs to crack and you can do 2 at a time (1 in each hand) it’s definitely speeds things up.
How to hold the egg
First how to hold it, here’s a few pictures with and without the egg. you want to grip the bottom half of the egg with your 3rd finger and the top half with you thumb, index and middle finger.
Cracking the egg

Before actually cracking the egg its good to get the hang on the hand motion you need to do.
First practise pulling inward with your 3rd and little finger whilst (trying) to keep the rest of your hand stationary.
Then at the same time move your thumb upwards. When doing this with the egg the thumb pulls the top of the egg open whilst the last 2 fingers pull the bottom half open.
Now to put it into action, hold the egg and make a crack halfway through it, pull it open with your fingers and throw away the shell.

Any problems give me a message, but keep in mind it takes a little bit of practise, i probably use anywhere from 10-100 eggs a day(!)
Good luck!

