Moderate-to-vigorous physical activity (MVPA) across experimental conditions.

<p>Average (±SE) daily MVPA rate (MVPA duration as a fraction of total time monitored) (A) and standardized MVPA duration (i.e., standardized to a 16 h waking day) (B) in passive control condition participants, active control participants who received a DDR active video game, and intervention group participants who received access to the Zamzee online feedback and rewards system.