Breaking it Down: Micro Goals in Physical Activity Tracking

Paper Title

Breaking it Down: Micro Goals in Physical Activity Tracking

Publication Info

• Topic area: Physical activity tracking and behavior change technology
• Keywords: Micro-goals, physical activity, smartwatch, goal setting, self-tracking, behavior change, notifications, sedentary behavior, user agency, wearable technology

Background and Problem

• Problem / challenge: Current physical activity trackers rely on fixed daily goals, which often fail to align with users' fluctuating schedules and routines. This rigidity can lead to frustration, disengagement, and abandonment of physical activity tracking.
• Significance: Short bursts of physical activity have proven health benefits, yet existing systems provide limited support for leveraging these opportunities. Addressing this gap could make activity tracking more flexible and engaging.
• Motivation and related work: Prior research highlights the pitfalls of rigid daily goals, including demotivation and misalignment with user needs. Efforts to introduce flexibility (e.g., secondary goals, adaptive targets) have shown promise but remain underexplored in the context of short-term, situated goals. This paper builds on these insights by formalizing and evaluating micro-goals.

Solution

• Proposed approach: The paper introduces Mikro, a smartwatch app that enables users to set micro-goals—brief, situated activity goals designed for short bursts of movement.
• Novelty:
  1. Introduces the concept of micro-goals as a flexible, user-driven alternative to daily step goals.
  2. Empirically evaluates micro-goals through a 27-day field study with 16 participants, analyzing their impact on physical activity practices and outcomes.
  3. Provides design implications for self-tracking technologies, emphasizing user agency, goal flexibility, and opportunistic engagement.
• Procedure and key techniques:
  • Mikro allows users to set short-term goals (e.g., "walk 300 steps in 10 minutes") via a smartwatch interface.
  • The app provides glanceable feedback on goal progress and includes preset step targets based on past activity.
  • A 27-day field study was conducted, including a baseline phase (7 days) and an experimental phase (20 days) with two conditions: 100% and 200% step target recommendations.

Results

• Concrete findings:
  • Participants set 599 micro-goals during the experimental phase, with a median of two goals per day.
  • Shorter goals (10 minutes) were more effective at prompting immediate action, with 29% followed by walking within 1 minute.
  • Adjusted micro-goals were more likely to be completed (54.6% vs. 44.9%) and involved more walking (median 464 steps vs. 266 steps).
• Advantage over baselines:
  • Micro-goals supported short bursts of movement and helped participants capitalize on brief opportunities for physical activity.
  • Participants walked more steps within adjusted micro-goals compared to default ones.
• Experiments / evaluation:
  • Study design: 27-day deployment with 16 participants, including baseline and experimental phases.
  • Metrics: Daily steps, time to initiate walking after setting a goal, goal completion rates.
  • Data sources: Logged activity data, smartwatch interactions, and semi-structured interviews.
• Limitations and future work:
  • Sample was predominantly young, male, and technically engaged, limiting generalizability.
  • Study duration (27 days) captured early adoption but not long-term engagement.
  • Future work should explore diverse populations, longer timescales, finer-grained goal durations, and integration with broader activity goals.

Summary

This paper introduces Mikro, a smartwatch app for setting micro-goals—brief, situated physical activity targets. A 27-day field study showed that micro-goals encouraged flexible, user-driven engagement with physical activity, supporting short bursts of movement that broke up sedentary time. Participants frequently adjusted default suggestions, with adjusted goals leading to higher completion rates and more steps. Notifications served more as awareness cues than direct triggers. While Mikro did not significantly increase overall daily steps, it demonstrated the potential of micro-goals to redistribute activity and promote opportunistic action. Future work should explore micro-goals with diverse populations, over longer periods, and in combination with other activity goals.