Jack Reacher's Rules

The combative grip. Right at the last split second pull your hand back a fraction and close around the knuckles, not the palm. The old Army trick is that they go to shake your hand, but they’re aiming to crush it. A macho ritual. The way out of it is to be ready. Pull back a fraction and squeeze back. Squeeze their knuckles, not the meat of their palm. Their grip is neutralized. They never stand a chance.

The campaigning politician grip. Fumble the handshake, and grip the back of the recipient’s hand, not the palm, creating a breathless “so much support here I’ve got to be quick” type of response. So it’s strictly the shaker’s choice when to let go.

Shake or squeeze. Your choice.