Measuring physical fitness in persons with severe/profound intellectual and multiple disabilities

If being physically fit is of the outmost importance, then what can be said about the fitness of persons with severe or profound intellectual, visual and motor disabilities? Exactly how could their level of physical fitness be measured? Formulated differently, if a person sees little to nothing and in addition has little comprehension of its immediate environment, then how should one go about testing? How motivated would this person be to be subjected to tests and to perform the tasks as well as possible?' Finding an answer to these questions formed the main incentive for this research. The important concrete results of this research are feasible, reliable, and valid tests for assessing physical fitness of persons with severe or profound intellectual and multiple disabilities, which can be directly implemented into the daily practice.