After potential participants contact the research team, the research team will schedule a phone screening with them to make sure they meet the criteria. If they pass the phone screening, visit 1 will be scheduled. If they fail the phone screening, their contact information and response to the phone screening questions will be destroyed. If an individual agrees to participate, they will complete the informed consent and they will be assigned a unique ID number. Eligibility will be first checked. Blood pressure will be measured three times using an automated blood pressure cuff after participants have been seated and rested for at least 10 minutes for an accurate reading. For participants who do not take medication that managing blood pressure, if they have systolic blood pressure \<120mmHg or diastolic blood pressure \<80mmHg they will not be allowed to participate. If an individual has systolic blood pressure \>140mmHg or diastolic blood pressure \>90mmHg they will not be allowed to participate without approval from their physician. If they are diagnosed with pre-hypertension or hypertension and are currently taking medication, they will need to provide a physician's note to participate. They will also be asked to complete a physical activity measure, the International Physical Activity Questionnaire (IPAQ) to assess their activity over the last week. If they accumulated more than 150 minutes of moderate and vigorous physical activity per week, they will not be eligible to participate. This will be checked by a member of the research team to ensure that they are eligible to participate. If the person meets criteria (other inclusion and exclusion criteria information is listed below separately in Inclusion/Exclusion section), they will be provided with additional information about the study and be guided through the Visit 1 data collection protocol and be informed about plans for Visit 2 (1 week later) and Visit 3 (approximately 3 months later). The visits will last about 60 minutes each, with Visit 2 being up to 90 minutes for participants randomly assigned to the Fitbit + Behavior Change Strategies (FB+) condition described below.

Visit 1. Visit 1 will include baseline measurements and providing participants with information about the monitors that they will wear to assess physical activity and sedentary behaviors at baseline and at the end of the intervention. They will schedule a time to come back the following week for their second study visit.

Visit 2. At the beginning of Visit 2, participants will be block randomized to their experimental condition and informed of their condition assignment. Randomization will occur in blocks of 5 to ensure that groups are experiencing similar environmental (e.g. weather) variations that may influence physical activity behaviors. Randomization will be done using a random number generator. Conditions are: use of the Fitbit alone (FB) or use of the Fitbit in combination with behavior change strategies (FB+). Descriptions of conditions are below. Regardless of condition, all participants will receive information about the Fitbit and will be given a guided tour of the device itself and the associated software. Participants will be given a username and password to be used with the software and will be encouraged to utilize the software over the next 3 months to assist them in becoming more physically active. Participants assigned to the FB condition will use their Fitbit on their own for the duration of 3-month intervention, similar to the experience of participants buying the device off-the-shelf. Those assigned to the FB+ condition will discuss their perceived benefits and barriers of becoming more physically active with health coach. Participants will also be encouraged to set a goal of their choosing related to using their Fitbit to increase their physical activity. Weekly progress reports will be sent to participants through Email on Monday. Participants assigned to this group will also receive weekly (first month), semi-monthly (second month), monthly (third month) phone contact from the health coach to follow-up on the achievement from previous week(s) and re-evaluate their goals based on their current behaviors.

Regardless of group assignment, during the 3-month intervention all participants will receive periodic (\~monthly) contacts (via email or phone) from the research team asking how they are using their Fitbits. For participants in the FB+ group, this contact can be at the same time as their check-ins. During this monthly contact, participants will be asked open-ended questions regarding how frequently the Fitbits are being worn, how often participants are looking at their data, and what aspects of the monitors and associated software/apps are particularly useful and/or motivating for them. They will be also asked about their physical health and well beings related to participate in the study as a safety check.

Approximately one week prior to the final visit (\~3 months after the start of the intervention), participants will be asked to come to the lab for a brief visit to pick up an objective activity monitor (ActiGraph) and to wear them for the next week in order to assess physical activity and sedentary time at the end of the intervention. At this time, participants will also be scheduled to return for their final study visit.

Visit 3 will be completed at the end of the 3-month trial. During this visit, participants will complete the same anthropomorphic, cardiovascular, and psychosocial measures assessed at baseline. They will be given the opportunity to complete an optional semi-structured interview with a member of the study team. This brief interview could be done during this visit or at another time that is convenient for the participant. The purpose of the interview would be to gather qualitative information from participants regarding their use of the monitors and factors that facilitated and/or impeded behavior change.

Twelve weeks after the intervention the investigator's will ask participants to complete the physical activity questionnaire once again to assess for long term changes in self-reported physical activity and secondary outcome measures.