Engagement, acceptability, usability and satisfaction with Active for Life, a computer-tailored web-based physical activity intervention using Fitbits in older adults

- Alley, Stephanie J.; Schoeppe, Stephanie; To, Quyen G.; Parkinson, Lynne; van Uffelen, Jannique; Hunt, Susan; Duncan, Mitch J.; Schneiders, Anthony; Vandelanotte, Corneel