Gym attendances and incentives

Last registered on March 22, 2021


Trial Information

General Information

Gym attendances and incentives
Initial registration date
March 22, 2021

Initial registration date is when the trial was registered.

It corresponds to when the registration was submitted to the Registry to be reviewed for publication.

First published
March 22, 2021, 1:14 PM EDT

First published corresponds to when the trial was first made public on the Registry after being reviewed.



Primary Investigator

Shenzhen University

Other Primary Investigator(s)

PI Affiliation
CUHK Business School, Chinese University of Hong Kong
PI Affiliation
Shenzhen University WeBank Institute of Fintech and Shenzhen Audencia Business School, Shenzhen University
PI Affiliation
Shenzhen University
PI Affiliation
Shenzhen University WeBank Institute of Fintech and Shenzhen Audencia Business School, Shenzhen University

Additional Trial Information

On going
Start date
End date
Secondary IDs
What incentive mechanism can effectively encourage people to establish good habits? We use the method of field experiment, and take exercise habits as the point of departure to study this issue. In particular, our subjects are university students, and we explore the influence of different incentive mechanisms on the frequency of students participating in sports. We mainly focus on non-monetary incentives.
External Link(s)

Registration Citation

Guo, Liang et al. 2021. "Gym attendances and incentives." AEA RCT Registry. March 22.
Experimental Details


we send messages to students via WeChat once a week. For different treatment groups, the messages have different contents.
Intervention Start Date
Intervention End Date

Primary Outcomes

Primary Outcomes (end points)
Gym attendence in and after the intervention
Primary Outcomes (explanation)

Secondary Outcomes

Secondary Outcomes (end points)
Secondary Outcomes (explanation)

Experimental Design

Experimental Design
We invite students to our lab to fill in a short survey about health and ask for their consent to access their data of using the university sports facilities. Then students are put into different treatment according to their previous gym attendance frequencies. In the control condition, we simply add them on WeChat without sending any messages. In the treatment conditions, we send different messages to them once a week for 5 weeks. After the intervention period, we keep monitoring them for around 6 months to see if they would develop a habit of doing exercises.
Experimental Design Details
Randomization Method
randomization done in office by a computer according to the frequencies of subjects' previous gym attendance.
Randomization Unit
Was the treatment clustered?

Experiment Characteristics

Sample size: planned number of clusters
500 students
Sample size: planned number of observations
500 students
Sample size (or number of clusters) by treatment arms
There are 1 control group and 4 different treatment groups, and each group consite of 100 students.
Minimum detectable effect size for main outcomes (accounting for sample design and clustering)

Institutional Review Boards (IRBs)

IRB Name
Shenzhen Audencia Business School IRB
IRB Approval Date
IRB Approval Number


Post Trial Information

Study Withdrawal

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Is the intervention completed?
Data Collection Complete
Data Publication

Data Publication

Is public data available?

Program Files

Program Files
Reports, Papers & Other Materials

Relevant Paper(s)

Reports & Other Materials