The line graph illustrates the proportions of individuals sorted by four different age groups who went to the gym once or more in a month, from 1984 to 2003.
Generally speaking, the chart highlights four distinct age groups. While individuals under 45 tended to engage in gym activities most frequently, these activities were less popular among those over 46 years old.
For individuals aged 18 to 25, in 1984, the proportion of gym participants increased gradually by 5% from 10% to 15%. After that, a rapid growth occurred, rising from less than 40% to nearly 65% between 1994 and 2003, making this age group the one with the highest participation rate. The percentage of gym-goers aged 26 to 45 showed slight fluctuations from 1984 to 1994, followed by a significant increase from nearly 35% to over 50%.
Regarding those aged 46 to 65, the period from 1984 to 1989 saw a minimal rise in gym participation, from around 25% to 30%. However, after 1989, the percentage sharply declined from 30% to nearly 15%. For individuals over 65, gym participation remained low for most of the period, with a steady increase occurring after 1992, rising from less than 10% to nearly 20%.