Do you have students who constantly forget their sporting uniform? Do they make excuses to get out of doing any physical activity? You wouldn't let them simply sit there in Mathematics or Science class.
Provide them with this theory worksheet instead. It focuses on all the aspects of being healthy and gets students to think about their daily lives. This will keep them busy for the whole period, so you can concentrate on running a great sporting lesson.
Word document form so you can tailor the questions specifically for your class.