Michigan Medicine - University of Michigan Apr 20 2026 Younger children and teens often have built-in opportunities to stay active through gym class, sports and extracurricular activities. But after high school, those structured options often disappear. And many young adults struggle to stay active during this transition, a national poll suggests. One in three parents say their child ages 18 to 25 is minimally active or inactive, according to the University of Michigan Health C.S. Mott Children'