America Walks: An Observational Study of Walking Behavior Based on Passive Step Tracking

America Walks is an observational research study to determine walking behavior of individuals in the United States. The entire study will be conducted virtually by requiring participants to download a mobile phone application (App), The App will leverage the mobile phone's step count sensor technology to automatically determine participants' daily walking activity. Participation is voluntary. Participants can choose not to participate or choose to participate and then stop participating. Participants decision will not result in any penalty or loss of benefits to which they are entitled.