träna käken

 https://www.youtube.com/watch?v=ARSDJp0JvO4

For people complaining they can't see the last two exercises, 

1. Thumbs under jaw with your mouth slightly open. You'll feel the pressure immediately.

2. The third one, keep your hand in front of your face like she did, then extend your jaw forward towards the hand. You will feel your jaw extend forward.

It's that simple

Her name is Peta Pryor and the program is called face aerobics.