This personalized trial will evaluate the effects of five behavioral change techniques (BCTs) described in Habit Formation Theory (Goal setting, Action Planning, Self-Monitoring, Behavioral Practice/Rehearsal and Habit Formation) delivered by text message to enhance low-intensity walking by 2,000 more steps per day/5 days per week in healthy Northwell employees aged 45-75 years old.

This pilot study uses a virtual, single-arm, personalized design to evaluate the effects of the five behavioral change techniques (BCTs) described in Habit Formation Theory (Goal Setting, Action Planning, Self-Monitoring, Behavioral Practice/Rehearsal and Habit Formation) delivered by text message to enhance low-intensity walking by 2,000 more steps per day/5 days per week in healthy Northwell employees aged 45-75 years old. Up to sixty participants will complete a 12-week personalized trial of their walking behavior and assess all five behavioral change techniques described in habit formation theory. Prior to beginning the trial, participants will be sent a Fitbit® activity tracking watch that monitors number of steps per day. Participants will be instructed to wear the Fitbit device all day and night, even when they are sleeping. The single-arm, personalized trial will be comprised of a 2-week baseline/screening phase and a 10-week intervention phase. During the baseline phase, participant's baseline levels of physical activity (operationalized as average steps per day measured using the Fitbit device) and adherence to the trial protocol (operationalized as wearing the Fitbit device for a minimum of 10 hours per day and completing daily survey measure) will be assessed. Participants who are adherent to the study protocol, defined as adherence to Fitbit use and survey measures on 80% or more days during baseline, will proceed to the intervention phase. At the beginning of the intervention, participants will develop a walking plan with the goal of walking 2,000 more steps per day than their average levels of baseline activity (e.g., if you walked an average of 6,000 steps per day during baseline, the new goal would be 8,000). The walking plan will include details about the day, time, and location of walking behavior. Participants will commit to walking according to this plan 5 days per week (e.g., walking 8,000 steps per day on 5 planned days. A time-sensitive text of all 5 BCTs will delivered to the participant when the context (e.g., day of week, time of day) that they pre-selected is encountered. Participants will later receive a text message with a link to a secure survey in which they will note whether they engaged with the five behavioral change techniques which were prompted. The goal of the intervention is to help participants make their walking behavior habitual and automatic. Participants will be assessed in terms of their satisfaction with the personalized trial design, their Fitbit-measured daily steps, adherence to their walking plan, and the automaticity of their walking behavior. After completion of the intervention phase, participants will be allowed to keep the Fitbit device.

Inclusion Criteria:

Men and women who:

• Age 45 - 75 years old of age
• Fluent in English
• Employed in the Northwell Health system
• Community-dwelling
• Report they are in good general health, walk regularly and have never been informed by a clinician that it was not advisable/safe to participate in a low-intensity walking program
• Owns and can regularly access a smartphone capable of receiving text messages
• Owns and can regularly access an e-mail account

Exclusion Criteria for Factors that May Limit Adherence to Interventions or Affect Conduct of the Trial

• < 45 years old or > 75 years old
• Unable to speak/comprehend English
• Not employed in Northwell Health system
• Have self-reported poor health, limited mobility and/or have been advised by a clinician not to increase their low-intensity walking
• Pregnancy
• Previous diagnosis of a serious mental health condition or psychiatric disorder, such as bipolar disorder

All collected IPD will be de-identified and pooled before sharing on the Open Science Framework, along with a data dictionary.

The study protocol, including he statistical analysis plan, will be made available in addition to the informed consent form following completion of recruitment but prior to publication of any data from the current study. De-identified, pooled individual participant data collection. We anticipate this data to be available on the Open Science Framework platform indefinitely.

All data and supporting information will be stored on the Open Science Framework, a free web application with no access restrictions.

Of those enrolled in the study, 44 participants began baseline assessment.

Data for adverse events were collected for each participant over 12 weeks (2-week baseline and 10-week intervention).