  The improvement of living standards and awareness of chronic diseases have
increased the importance of community sports organizations in promoting the
physical activity levels of the public. However, limited understanding of human
behavior in this context often leads to suboptimal resource utilization. In
this study, we analyzed the participation behavior of 2,956 members with a time
span of 6 years in a community sports organization. Our study reveals that, at
the population level, the participation frequency in activities adheres to a
power-law distribution. To understand the underlying mechanisms driving crowd
participation, we introduce a novel behavioral model called HFBI
(Habit-Formation and Behavioral Inertia), demonstrating a robust fit to the
observed power-law distribution. The habit formation mechanism indicates that
individuals who are more engaged are more likely to maintain participation,
while the behavioral inertia mechanism suggests that individuals' willingness
to participate in activities diminishes with their absences from activities. At
the individual level, our analysis reveals a burst-quiet participation pattern,
with bursts often commencing with incentive activities. We also find a
power-law distribution in the intervals between individual participations. Our
research offers valuable insights into the complex dynamics of human
participation in community sports activity and provides a theoretical
foundation to inform intervention design. Furthermore, the flexibility of our
model enables its application to other data exhibiting power-law properties,
broadening its potential impact beyond the realm of community sports.
