Outdoor community walking plus usual care group (walking group)
The participants who were randomized to the walking group were asked to train 3 days per week for 24 weeks. Each week consisted of two sessions in a supervised group and one unsupervised session at a location of their choice. The walking program was based on a protocol published by Ettinger et al. [All study staff (trainers and research assistants) participated in a half-day workshop for protocol training, which included instructions about administering the program, monitoring adherence, and education about behavioral change [