Well-being is fundamental for health. However, health and well-being are under threat by increased prevalence of depression and physical inactivity. Interaction with the natural environment may prevent these critical health issues, as research has shown that walking outdoors contributes to better well-being than walking indoors. The aim of this thesis was to investigate outdoor group walks as a potential public health intervention to enhance positive mental and emotional well-being, reduce stress, and foster resilience. This thesis evaluated Walking for Health, a national group walking programme in England using a nonexperimental, longitudinal design. Individuals who did (Group Walkers) and did not (Non-Group Walkers) take part in outdoor group walks completed two online questionnaires about their mental and emotional well-being, and covariates. To gain a broader understanding of how outdoor group walks may contribute to positive well-being, integrations were proposed between the Attention Restoration Theory and the psycho-evolutionary model, and the theories of coping and resilience. Findings show that Group Walkers had greater mental well-being and positive affect, and less negative affect, depression and perceived stress than Non-Group Walkers. Group walking had no affect on social well-being, connectedness to nature or resiliency. Outdoor group walk participation affected positive well-being through a decrease in perceived stress, and an increase in physical activity. Group Walkers demonstrated resilience against adversity on negative affect. No evidence of resilience from outdoor group walks was found for mental well-being, positive affect or depression. Group walks in farmland and green corridor environments may further boost mental well-being, and reduce negative affect and perceived stress, when compared to group walks in the urban environment. This research suggests that outdoor group walks are effective at improving mental and emotional well-being, and could be a useful public health intervention to reduce stress and foster resilience. Implications for theory are discussed.

Older Australians walk for many reasons: health, recreation and transport. However, road safety statistics show that pedestrians over 65 represent one-third of Australia's pedestrian deaths. As Australia's population ages in place and older people take up a walking regime for health and transportation reasons, they need a supportive suburban setting. Urban design theories discuss such "pedestrian-friendly" concepts as sense of place, sense of community, responsive environments, traditional neighbourhood design, transit-oriented development, and crime prevention through environmental design. To investigate these concepts in relation to older pedestrians, this study brings together two areas of literature - research into older pedestrians in relation to urban design theories. Qualitative research methods were used in two case studies, to reveal how older people's interpretation of their local walking environment relates to urban design theories concerning walkable suburbs. The two Brisbane suburbs of Bulimba and Forest Lake were chosen for study, as they have different histories, topographies, street patterns, and other variations. Analysis of key themes gathered from two focus group discussions, one from each suburb, revealed the significance for participants of social interaction when walking for health. A photographic exercise performed by the Forest Lake focus group provided pictorial information for analysis, and revealed participants' interest in the lake's fauna and flora, and in its ongoing maintenance. The study was limited by an unforeseen failure to obtain the cooperation of the Bulimba group in the photographic exercise. In support of the claims made in the literature review, it seems that when older pedestrians walk through suburban streets, they avoid steep hills, busy roads, and intersections where possible, and require footpaths with even surfaces and shelters. When walking for health reasons, participants in this study did not favour local streets, but preferred "natural" places designed exclusively for walkers. Forest Lake participants stated a preference for driving to places they deemed suitable for walking, which suggests a need for more detailed design attention to the urban design qualities of local streets, so that those older people without cars are not disadvantaged.