11.   Changes were also made in physical education classes to introduce more vigorous activities and minimize the time children spent simply standing around.

12.   Despite the implied commitment to exertion in its title, Outside has never felt entirely bound to the idea of vigorous activity.

13.   Drink at regular intervals throughout the day before you get thirsty, as well as before, during and after vigorous activity or exercise.

14.   Even more alarming for Henry and others who deal with young females is the rapid falloff in vigorous physical activity as adolescent girls grow into young women.

15.   For vigorous activities that last longer than an hour, Dr. Kleiner suggests consuming a sports drink as a replacement fluid.

16.   So is an adequate warm-up before plunging into vigorous activity.

17.   Students in the program also reported more moderate to vigorous activity in their physical education classes.

18.   The Centers for Disease Control and Prevention estimates that fewer than one-quarter of children engage in daily vigorous activity.

19.   The children ate school lunches lower in fat than usual and took physical education classes in which they had to maintain moderate to vigorous activity levels.

20.   The decision will therefore spur vigorous legal activity on two fronts.