At 4.24 the sensei showed how some students jumped. This would be the way many people in their senior years would jump. Some might not even be able to jump at all, and merely "walk" through the movement. But younger and fitter students should learn to do the jump as demonstrated afterwards.
Salute. But one thing I disagree if you do gyaku zuki with complete hip rotation, you are not in kokutsu dachi. Therefore, in kokutsudachi gyaku zuki your torso should not be 180*
