Experimental: Motivational Enhancement System (MES) and Physical Activity Tracking (PAT)

MES is a web-based, mobile asthma management intervention delivered to participants' personal mobile devices. There are 4 sessions, completed over 10 weeks, with each session taking approximately 15-20 minutes. During Session 1, participants will identify asthma-related problems they may encounter and will receive asthma information and motivation. Between Session 1 and Session 2, participants will be asked to complete an electronic daily diary for 7 days. Session 2 allows participants to select up to 2 goals to address. Session 3 occurs over the course of 4 weeks and provides tailored messages based on problem and goal selection. The final session (Session 4), asks participants for feedback on how well they feel they accomplished their goal. Additionally, participants will be asked to track their daily and weekly step totals as well their total minutes of moderate to vigorous physical activity using a wearable activity tracker provided by the study.

Experimental: Supportive Accountability (SA) and PAT

SA is an asthma management intervention delivered by asthma nurses trained in targeted MI skills (e.g., open-ended questions around change talk, affirmations) via participants' personal mobile devices (e.g., Skype, FaceTime, voice calls, and SMS). Sessions with the nurse will be approximately 15-20 minutes in length and will focus on ways to improve asthma care. There are 4 sessions with the nurse, over the course of 10 weeks. Additionally, participants will be asked to track their daily and weekly step totals as well their total minutes of moderate to vigorous physical activity using a wearable activity tracker provided by the study.

Experimental: Text Messaging (SMS) and PAT

SMS will target asthma knowledge. One-way SMS messages will be sent to participants' personal mobile devices with facts about asthma management, links to educational web content, and videos providing information about living with asthma. Text messages will be sent twice a week for the first 5 weeks and once a week for the last 5 weeks. Additionally, participants will be asked to track their daily and weekly step totals as well their total minutes of moderate to vigorous physical activity using a wearable activity tracker provided by the study.

Experimental: MES_SMS_PAT

Participants will receive a combination of the MES and SMS interventions. Additionally, participants will be asked to track their daily and weekly step totals as well their total minutes of moderate to vigorous physical activity using a wearable activity tracker provided by the study.

Experimental: SA_SMS_PAT

Participants will receive a combination of the SA and SMS interventions. Additionally, participants will be asked to track their daily and weekly step totals as well their total minutes of moderate to vigorous physical activity using a wearable activity tracker provided by the study.

No_intervention: Usual Care_PAT

Participants will continue to receive standard clinical asthma care. Additionally, participants will be asked to track their daily and weekly step totals as well their total minutes of moderate to vigorous physical activity using a wearable activity tracker provided by the study.