  In today's connected society, many people rely on mHealth and self-tracking
(ST) technology to help them adopt healthier habits with a focus on breaking
their sedentary lifestyle and staying fit. However, there is scarce evidence of
such technological interventions' effectiveness, and there are no standardized
methods to evaluate their impact on people's physical activity (PA) and health.
This work aims to help ST practitioners and researchers by empowering them with
systematic guidelines and a framework for designing and evaluating
technological interventions to facilitate health behavior change (HBC) and user
engagement (UE), focusing on increasing PA and decreasing sedentariness. To
this end, we conduct a literature review of 129 papers between 2008 and 2022,
which identifies the core ST HCI design methods and their efficacy, as well as
the most comprehensive list to date of UE evaluation metrics for ST. Based on
the review's findings, we propose PAST SELF, a framework to guide the design
and evaluation of ST technology that has potential applications in industrial
and scientific settings. Finally, to facilitate researchers and practitioners,
we complement this paper with an open corpus and an online, adaptive
exploration tool for the PAST SELF data.
