Financial Incentives for Increasing Exercise

Participants will be employees of Genzyme who volunteer to participate in a study on
motivating healthy behaviors, involving giving them goals for taking a certain number of
steps per day, and increasing that number over time. Participants will wear pedometers and
upload their data to a website that allows them to monitor their progress, and have the
opportunity to win money based on meeting their step goals.

Interested employees will schedule a day and time to complete a health screening at a
"Health Fair" at their place of employment, to ensure that they are healthy enough to
participate; at this time participants will also complete the investigators baseline
dependent measures, and receive a pedometer. After a one-week baseline period during which
they wear the pedometer and the investigators establish their typical number of steps per
day, eligible participants will then be assigned to one of four treatments - a "no
incentive" control condition, and three conditions in which they are entered into different
kinds of monetary lotteries if they have met their step goals for that day. Participants'
initial goal will be based on their steps during the baseline period, and the goal will
increase by 250 steps each week, for a total of 12 weeks. After these 3 months, the
incentives portion of the experiment ends, but participants continue to wear their
pedometers and upload their data for an additional 6 months. At 3 months, 6 months, and then
at the study end at 9 months, participants again complete the investigators dependent
measures at follow-up Health Fairs at their place of employment.