In a randomized field experiment, we show that a low-cost intervention, weekly email reminders, increases the weekly exercising frequency of gym members by 13%, with the effect being larger for class training (19%) than for free training (11%). We find that nearly all types of individuals benefit from the reminders (e.g., students, nonstudents, women, men, new members, recurring members), and this effect persists in a three-month posttreatment period. Furthermore, the increase in class visits is partly driven by an increase in the number of bookings of gym classes and a slight decrease in the share of bookings that are canceled. Limited attention and habit formation can best explain these results. In contrast to the increase in gym attendance, we do not find any effect on the duration and renewal of membership contracts.

在一项随机的野外实验中，我们发现，低成本干预（每周电子邮件提醒）使体育馆员的每周锻炼频率增加了13％，与课堂培训（19％）相比，免费培训（11％）的效果更大。 ）。我们发现，几乎所有类型的个人都可以从提醒中受益（例如，学生，非学生，女性，男性，新成员，经常性成员），并且这种效果在治疗后的三个月中持续存在。此外，上课次数增加的部分原因是，体育课预订量的增加和被取消预订量的份额略有下降。有限的注意力和习惯养成可以最好地解释这些结果。与增加体育馆出勤率相反，我们认为对会员合同的期限和续签没有任何影响。