Participants who are eligible for the GET Active Study and are randomly assigned to Treatment As Usual will be asked to download a mobile sensing activity monitoring app called the Effortless Assessment of Risk States (EARS) app which will derive activity data. The activity data will be collated to yield weekly summary measures that will be sent via short messaging services (SMS) text messaging to participants randomized to the control condition for viewing.

GET ActivE intervention uses the Vira mobile application and a health coach, integrating mobile sensing, self-report assessment, and just-in-time nudges and notifications from a health coach to increase patient activity and promote positive mood cycles. A health coach reinforces Behavioral Activation (BA) principles and encourages engagement with activities by composing and triggering appropriate intervention nudges and messages (by text, phone call, video call, chat, email, etc.) specific to activity patterns and mood ratings highlighted on the Vira app. The health coach reviews the patient's data from the Vira practitioner dashboard and will follow up with patients at least weekly (and caregivers periodically) to reinforce behaviors that are consistent with BA and personally relevant based on the participant's own mobile sensing data and mood ratings.

The GET ActivE health coach will review data from the Vira app and send nudges to the participant with insights encouraging them to engage in activities that bring enjoyment or pleasure.

The study will observe high GET ActivE intervention feasibility (50% of eligible youth approached will enroll; completion >50%; attrition <20%)

Participants will respond to health coach contacts >80%

Acceptability of the GET ActivE intervention will be assessed through the 4 item Acceptability of Intervention Measure (AIM). Individual item scores are summed. Scale values range from 1 to 5. No items are reverse scored. Higher scores indicate greater acceptability. The items include questions to determine if intervention is appealing to, liked by, welcomed by, and approved by study population.

Intervention appropriateness of the GET ActivE intervention will be assessed through 4 item Intervention Appropriateness Measure (IAM). Individual item scores are summed. Scale values range from 1 to 5. No items are reverse scored. Higher scores indicate greater appropriateness. The items include questions to determine if intervention is a good match, fitting, suitable, or seems applicable to the study population.

Anhedonia will be assessed using the self-reported Behavioral Avoidance/Inhibition (BIS/BAS), 24 item scale. The scoring ranges from 1-4 and response options include: Very true for me (1); somewhat true for me (2); somewhat false for me (3); very false for me (4). Total range of scores possible is 24-96. The lower the score reported on BIS/BAS, the less pleasure or enjoyment a responder feels and more anhedonic symptoms are expressed.

Suicidal attempt & ideation will be measured through the Columbia Suicide Severity Rating Scale (C-SSRS). Assign score of 0 if no ideation/behavior present and assign a score of 1 if ideation/behavior present. A "yes" answer any time during treatment to any 1 of the 5 suicidal behavior questions (Categories 7-10) on the C-SSRS. C-SSRS Categories 7-10 are as follows: 7-Aborted Attempt 8-Interrupted Attempt 9-Actual Attempt (non-fatal) 10-Completed Suicide. Any score greater than 0 is important/may indicate need for intervention.