Falling is a frequent and serious problem for adults with intellectual disability (ID); however no fall prevention interventions for this historically disadvantaged group have been described. Based on our extensive pilot work we have developed a novel, individualised, physiotherapy intervention programme for adults with ID. This intervention is aimed at reducing falls risk by strengthening leg muscles and improving balance and participation in physical activity. In this Feasibility Study we aim to evaluate the acceptability and feasibility of the proposed intervention and trial our recruitment processes and outcome measures before embarking on a randomised controlled trial (Full Study) to investigate the intervention's efficacy. We will provide the intervention to participants supported by three service organisations, one of which is a Maori organisation. We will use qualitative methodologies to explore the perceptions of people with ID, the service organisations, the support workers, family/whanau and the physiotherapists participating in the provided intervention.