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Background : A recent randomized controlled trial found that an intervention focused on developing an exercise habit increased weekly minutes of moderate to vigorous physical activity (MVPA) over 8 wk compared to a control group. The purpose of the current study was to test if changes in habit, as well as other behavioral strategy constructs from the Multi-Process Action Control Test, mediated between group condition and MVPA (self-report and accelerometry). Methods : Inactive new gym members ( N  = 94) were randomized into control or experimental (habit-building) groups. Results : No construct entirely explained mediation condition (experimental and control) and changes in MVPA measured by accelerometry. Self-report MVPA found affective judgments, behavioral regulation, and …