Integrating smartphone technology, social support and the outdoor built environment to promote community-based aerobic and resistance-based physical activity: rationale and study protocol for the 'ecofit' randomized controlled trial

- Jansson, Anna K.; Lubans, David R.; Smith, Jordan J.; Duncan, Mitch J.; Bauman, Adrian; Attia, John; Robards, Sara L.; Plotnikoff, Ronald C.