Study Comparing the Effectiveness of Incentives on Physical Activity Behavior in a Health Insured Population

"The incentive arms comprised a Direct Payment Group, a Charity Incentive Group, a Lottery Pay-out Group, and a Choice Group. Members were offered the base program and supplementary communication described above. In addition, individuals were offered the equivalent of one of four possible incentive amounts depending on the level of participation in fitness-related activities. Enrollment into the trial took place for a period of 5 months, and the intervention took place over a period of 12 months following registration.~Level 1: \<150 fitness points per month - equivalent to \< 1 gym visit per month - no reward, up to Level 5, which was \>3000 fitness points/month - equivalent to \>20 gym visits/month."