App-Based Intervention Combining Evidence-Based Behavior Change Techniques With a Model-Based Reasoning System to Promote Physical Activity Among Young Adults (Active2Gether): Descriptive Study of the Development and Content

App-Based Intervention Combining Evidence-Based Behavior Change Techniques With a Model-Based Reasoning System to Promote Physical Activity Among Young Adults (Active2Gether): Descriptive Study of the Development and Content

Authors of this article:

Anouk Middelweerd¹ ;   Saskia J te Velde^{1, 2} ;   Julia S Mollee³ ;   Michel CA Klein³ ;   Johannes Brug^{1, 4}