==== Front Innov Aging Innov Aging innovateage Innovation in Aging 2399-5300 Oxford University Press US 10.1093/geroni/igaa057.3090 igaa057.3090 Abstracts Session 7655 (Symposium) AcademicSubjects/SOC02600 Promoting Adherence to Exercise Prescription Using Mobile Health Technology: Lessons Learned from Older Adults Zlatar Zvinka Nebeker Camille University of California, San Diego, La Jolla, California, United States 2020 16 12 2020 16 12 2020 4 Suppl 1 Program Abstracts from The GSA 2020 Annual Scientific Meeting “Turning 75: Why Age Matters”843 843 © The Author(s) 2020. Published by Oxford University Press on behalf of The Gerontological Society of America.2020This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.Abstract We will present the implementation approach used to evaluate a novel mobile health (mHealth) exercise intervention designed to improve older adult’s fitness and brain health. A randomized controlled trial design evaluated if the use of mHealth strategies improved walking speed in real world environments to help participants achieve current physical activity guidelines. Cognitively healthy older adults were randomized to a 12-week, unsupervised, exercise prescription condition or to a healthy aging education condition. Participants used a heart rate tracker programmed to provide haptic feedback when they fell outside of their prescribed heart rate target during an exercise session. Participant’s perceptions regarding the mHealth technology device, as well as their feedback regarding the privacy of their data when using mHealth devices will be presented. Recommendations to improve the design of future mHealth exercise trials will be discussed.