A recent study focused on the daily habits of individuals who reported higher levels of happiness. The study recorded various factors such as time spent exercising, socializing, and engaging in hobbies. According to the results, individuals who exercised for at least 30 minutes a day, interacted socially with friends at least three times a week, and spent time on personal hobbies reported significantly higher happiness levels compared to those who did not engage in these activities.

Based on this study, which of the following statements must be true?