Visit the National Academies Press online and register for

Ideal Type, Length, and Duration of Physical Activity
Intervention trials that examine the relationship between physical 
activity and mental health often fail to specify the exact nature of the 
intervention, making it difficult to determine the ideal frequency, intensity, 
duration, and type of physical activity involved (Penedo and Dahn, 2005; 
Ahn and Fedewa, 2011; Biddle and Asare, 2011). 

---

Copyright © National Academy of Sciences. All rights reserved.
Educating the Student Body: Taking Physical Activity and Physical Education to School
134