The line graph illustrates the percentage of North American citizens of different age groups who often went to the gym over a 20-period, commencing from 1990.
Overall, during the period shown, people from the 18-23 and 34-43 age groups saw a dramatic increase in their figures, while the others recorded an opposite trend. Also of note is that the share of adolescents doing gymnastics ranked first in the entire chart.
To elaborate, in 1990, up to 15% of adolescents frequently went to the gym, after which it saw significant growth to 25% in 2010, and ranked its leading position of the surveyed timeline. The percentage of citizens from the 24-33 age group increased from 15% to a peak of 25% in 2006 before decreasing remarkably to nearly 15% in 2010.
Regarding categories with lower figures, starting at approximately 10%, the share of adults at around 24-33 years old doing gymnastics saw a slight growth to up to 10% during 30 years. Citizens from the 44-53 age group seemed to not frequently go to the gym, with its figure havoring at 5% and bottoming the chart during the timeline.