The overall goal of this study is to test personalized mobile phone-based physical activity
interventions among staff members at the University of California, Berkeley. Most physical
fitness applications for smartphones and activity trackers use a constant goal for the number
of steps each day. However, if the step goals are dynamically adjusted according to past
behavior, then the corresponding goals may encourage individuals to increase their physical
activity level. This study consists of a randomized controlled trial in which we are
assessing the efficacy of two different algorithms for calculating personalized goals for the
number of steps each day.