Experimental evidence of limited attention at the gym
通过随机田野实验发现，每周邮件提醒这种低成本干预能使健身房会员的每周锻炼频率提高13%，对课程训练效果更大，且几乎对所有人群都有效，有限注意和习惯形成可以解释这一结果。
Abstract 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.