Due to lack of high quality studies and often only one manuscript reporting on a particular determinant , we concluded " insufficient evidence " for most associations between determinants and physical activity or exercise .
Background The health benefits of regular physical activity and exercise have been widely acknowledged .
Unfortunately , a decline in physical activity is observed in older adults .
Knowledge of the determinants of physical activity ( unstructured activity incorporated in daily life ) and exercise ( structured , planned and repetitive activities ) is needed to effectively promote an active lifestyle .
Our aim was to systematic ally review determinants of physical activity and exercise participation among healthy older adults , considering the method ological quality of the included studies .
Dropout from exercise programs for seniors: a prospective cohort study.
This study examines dropout incidence , moment of dropout , and switching behavior in  organized exercise programs for seniors in the Netherl and s , as determined in a prospect i ve cohort study ( with baseline measurements at the start of the exercise program and follow-up after 6 months ; N = 1,725 , response rate 73 % ) . Participants were community-living individuals 50 + who participated in different forms of organized exercise programs .  The average dropout incidence was 0.15 per 6 months , which is lower than that for the general population . The dropout incidence and the timing of dropout differed substantially between the exercise programs . In total , 31 % of people who dropped out of one type of exercise program switched to another type of exercise .  The type of program and exercise had a strong effect on differences in this switching behavior . It is recommended that switching behavior be monitored in future studies
Due to lack of high quality studies and often only one manuscript reporting on a particular determinant , we concluded " insufficient evidence " for most associations between determinants and physical activity or exercise .
Background The health benefits of regular physical activity and exercise have been widely acknowledged .
Unfortunately , a decline in physical activity is observed in older adults .
Knowledge of the determinants of physical activity ( unstructured activity incorporated in daily life ) and exercise ( structured , planned and repetitive activities ) is needed to effectively promote an active lifestyle .
Our aim was to systematic ally review determinants of physical activity and exercise participation among healthy older adults , considering the method ological quality of the included studies .