Background
’ ambulation
For older adults, walking is a popular form of physical activity [Patla and Shumway-Cook proposed a widely accepted theoretical framework of eight dimensions of individual and environmental factors important for older adults’ ambulation in the community [The Getting Older Adults Outdoors (GO-OUT) study was a two-group randomized controlled trial (RCT; registered 25/09/2017 with ClinicalTrials.gov NCT03292510) designed to build physical capacity and self-efficacy to walk outdoors in older adults with self-reported limitations in outdoor walking for any reason, including physical impairments and low motivation [Results of the GO-OUT RCT showed no statistically significant differences between the OWG and WR group in change from baseline in minutes spent walking outdoors [Assessing implementation fidelity of the delivery of intervention components and participant engagement by receipt of intervention are important to establish internal validity in RCTs, provide context to study results, and provide insight into how interventions can be improved [The objectives of this quantitative process evaluation were to determine: 1) implementation fidelity (the extent to which elements of the intervention were delivered as specified in the original protocol) and 2) participant engagement (the receipt of intervention components by the participants). The results of the process evaluation will help to better understand the main study results, and provide information on the feasibility of implementing the outdoor walking program.