If you want your kids to do well in school, make sure they get regular exercise. In a new study published in the journal Medicine & Science in Sport & Exercise, researchers in Switzerland conducted shuttle run tests on students aged 8 to 12 to assess the children’s cardiovascular fitness. They found that students who were more physically fit earned better grades in math and an advanced French course. They observed that kids’ physical fitness was linked to better executive functions, like cognitive flexibility, that led to improved school performance. The study at least suggests that schools should consider not abandoning physical education classes in favor of academic subjects.