At what point does the left and right hook stop?

[AlexKid]

and how do you make it stop at that point?

Also is there any danger of slipping a disc in your spine ifyou over rotate or rotate too violently for your abdominal muscles to cope?

Also do you make it so the force goes straight rather than circular at the very end of the punch?

[greynotsoold]

The left hook begins with your left hand thumbs up; the follow through ends when the two large knuckles of your left hand touch your right shoulder. The opposite would be for a southpaw.