Adults with intellectual disability (ID) have significantly lower levels of fitness compared to the general population. The study examined the effects of a multicomponent familiarization intervention, consisting of a visual activity schedule and a video-enhanced system of least-to-most prompting, both displayed via an iPad, on the acquisition of resistance-training exercise tasks by adults with ID, aged 18-44 years, in a community fitness center. Twelve participants were randomly allocated to an experimental group (EG) and 12 to an active control group (CG). ANOVA revealed EG correctly and independently performed a significantly greater number of steps of four resistance-training exercise tasks compared with CG, relative to preintervention levels (p < 0.01). The intervention was effective in promoting functional performance of resistance-training exercise tasks among adults with ID.