The outlined research will study a mechanism for repeated betting in a field experiment to address the planning-ongoing gap described above, and test it against various other incentive schemes and a control group. We focus on an environment in which participants try to increase their physical activity by taking more steps each day. The counted steps are measured, showed and sent via a specifically designed smartphone app. We have implemented four treatment groups. All four conditions start with a 15-day baseline to measure individuals’ initial performance. Based on this data, we calculate the median for each participant, which will be used as an individual goal for the rest of the study. We then inform each participant of their target and start collecting data for another 15 days. At time of running the baseline and pre-intervention phase, participants are not aware that we assign them an individual goal and how it will be determined. Once the previous phase is completed, the experimental manipulation begins: Participants in the control condition are simply told that they will get a participation fee (25 Euro) at the end of the study, regardless of how often and to what extent they have achieved their goal. In the "bonus" condition, we offer participants a bonus: participants will receive the same information as in the control condition but gain an additional bonus (0.25 Euro) for each day on which they have reached or exceeded their individual goal. Within the "one shot betting" condition, subjects are offered the option (which they can accept or decline) to deposit a percentage of their participation fee (20 Euro) to double this stake if they reach their goal on 90% of the days. In case the subjects accept this commitment device but fail, they lose their stake. In the last condition, "repeated betting", participants are offered to take part in a daily bet where they could earn additional money (0.25 Euro) for each day they achieve or exceed their goal and lose money (2.00 Euro) if they fail. By further observing participants’ physical activity once the incentives are removed, potential long-term effects and sustainable behavior changes are finally examined.