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Evaluating an Incentive-Based mHealth App for Physical Activity Promotion Using the Obesity-Related Behavioral

Babac Salmani¹, Madison S Hiemstra¹, Harry Prapavessis¹

¹School of Kinesiology, Faculty of Health Sciences, Western University, 1151 Richmond Street, London, ON, Canada, 1 519-661-2111.

JMIR Formative Research

|April 10, 2026

Summary

This summary is machine-generated.

This study tested a mobile health app with small financial incentives for physical activity. While recruitment was low, the app showed high engagement and acceptability, suggesting potential for future refinement.

Keywords:

behavioral economics digital health financial incentives health behavior change mHealth physical activity

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Area of Science:

Public Health
Digital Health
Behavioral Science

Background:

Physical inactivity is a major public health issue, particularly in the UK.
Smartphone-based mobile health (mHealth) apps offer a scalable solution to promote physical activity (PA).

Purpose of the Study:

To evaluate the feasibility of an mHealth app delivering microincentives for PA.
To assess recruitment, retention, engagement, and acceptability of the intervention.

Main Methods:

A 5-week, single-arm proof-of-concept study using the Caterpillar Health app.
Participants received microincentives (points) for daily step goals and educational quizzes.
Feasibility outcomes were assessed using descriptive statistics; preliminary effectiveness via paired-samples t tests.

Main Results:

Recruitment rate was 16.1% (46/285 downloads).
Retention rate at 5 weeks was 54.3% (25/46 participants).
No significant increase in daily step count was observed; step goal achievement decreased over time.

Conclusions:

High engagement and acceptability suggest potential for mHealth interventions with microincentives.
Future pilot testing of a refined app and study protocol is warranted.
Modifications may include broader reward options and a simplified consent process.