Small Monetary Incentives to Promote Exercise (Exercise4Good; EX4G)

This study is for physically inactive adults with an active membership at a Greater Providence Young Men\'s Christian Association (YMCA). Participants will receive weekly feedback on their attendance at the YMCA, and will be enrolled in the study for 1 year. Participants will be assigned to one of three conditions, to either receive weekly: (i) monetary incentives, (ii) donations to a charity of their choice, or (iii) feedback only. In order to continue to receive incentives, participants must maintain an active membership at the YMCA.