The first pilot project aims to efficiently identify the distinct, effective behavior change techniques (i.e., building blocks) that are preferred for improving low-intensity physical activity (e.g., walking) in older, otherwise healthy, community-dwelling adults to be included in later-stage multi-behavior change technique interventions. The second pilot project aims to formally test the habit-formation theory to improve walking in a second sample of older, otherwise healthy, community-dwelling adults by employing its behavior change techniques and hypothesized mechanism of action—cognitive automaticity. The projects’ success is contingent on the creation of a practical, science-based, prevention-driven suite of behavioral interventions that are successfully implemented in the real world to improve the health and vitality of older adults.