According to an aspect, there is provided an apparatus (2) for assessing the mobility of a subject, the apparatus (2) comprising a processing unit (4) that is configured to obtain measurements of the movements of the subject over time； process the obtained measurements of the movements to determine values for a first plurality of parameters； and combine the determined values for the first plurality of parameters to determine an estimate of the time that the subject would take to complete a timed up-and-go, TUG, test.
