Exercise interventions can improve mobility in people with Parkinson's disease (PD). Recently, it has been shown that an Agility Boot Camp intervention with Cognitive Challenge (ABC-C) successfully improved certain aspects of mobility in people with PD. However, it is unclear whether the ABC-C alters the daily activity levels of people with PD and if an individual's daily physical activity levels during the ABC-C are associated to their response to the intervention itself. This study aims to determine whether the ABC-C alters daily physical activity habits in people with PD and understand if daily activity correlates with their response to the ABC-C.