This video shows one of a number of bunkai-based pad drills that we covered at a seminar in Stuttgart, Germany in June 2016. These pad drills include various throws that can be found in the Pinan / Heian kata. This video looks at the hip-throw that can be found at the end of Pinan / Heian Sandan.
While traditional karate includes many throws, karate is first and foremost a striking system. It is therefore important to practise the throws in a manner that is integrated with the core strikes. Drills like this can be a useful part of this side of karate practise.