There are plenty of physiotherapy assistants employed in the Hospital system in NZ. In the hospital I work in we employ "therapy assistants" so they support speech language therapists, occupational therapists and physiotherapist. As a physiotherapist we give therapy assistants specific exercises to do with specific inpatients or outpatients, it is always with patients we have already assessed and they are not responsible for progressing the patient. We also often get them to help us with less mobile patients that need 2 people. Other duties our therapy assistants do include exercises with patients prescribed by SLT's or OT's, delivering equiptment to patients houses, being present for pool sessions and cleaning. Other hospitals do have specific physiotherapy assistants. There aren't any particular requirements to work as an assistant, but hospitals may be reluctant to employ you if they know its only temporary. However if you are applying for your registration they may be happy to employ you as an assistant until your registration comes through and then employ you as a physiotherapist after that. We recently did that with 3 new graduates.