Older Adults: - Age ≥65 years. - With or without mild dementia. - Willing to consent to participate in the study or have an LAR that is willing to consent for their participation in the study - Willing to wear a Fitbit smartwatch, receive text messages, watch intervention-related videos, participate in physical therapy, and walking exercise. - No contraindications to engaging in physical activity. Care Partners: - Age ≥18 years. - Met criteria for survey participation. - Person being cared for is recruited in the study. - Willing to consent to participation - Willing to wear a Fitbit smartwatch, receive text messages, watch intervention-related videos, participate in physical therapy, and walking exercise. - No contraindications to engaging in physical activity.

Older Adults: - Severe cardiac, neurologic, or musculoskeletal condition (including but not limited to recent or untreated fracture in any part of the body) - limiting participation in daily walking or Fitbit smartwatch use. - Moderate to severe dementia (using the clinical dementia rating scale of 2 or higher - Inability to operate or manage a Fitbit smartwatch device (even with care partner support). - No phone or phone not capable of receiving text messages or watching videos. - No internet for watching videos Care Partners: - Severe cardiac, neurologic, or musculoskeletal condition limiting participation in daily walking or Fitbit smartwatch use. - Pregnant care partners - Any level of dementia or cognitive impairment among care partners - Inability to operate or manage a Fitbit smartwatch device. - Inability to co-participate in intervention tasks with older adult - No phone or phone not capable of receiving text messages or watching videos. - No internet for watching videos