 The investigators will conduct a 8-week proof-of-concept randomized controlled trial to provide preliminary evidence of efficacy of Fit Brains Rosetta Stone Canada training -- a mobile cognitive training program -- on cognitive and brain plasticity in older adults. The investigators will also explore whether Fit Brains training paired with a brief bout of exercise would enhance the potential cognitive benefits of Fit Brains. In addition, the investigators will explore the long-term effects of cognitive training by performing a 1-year follow-up measurement i.e., 1-year after study completion. 