Edweek blogs about acting out content.  There are several links to different studies.  From the blog:  researchers found that elementary mathematics students who acted out text in word problems were more accurate and less distracted than those who didn’t.
This is an important point for multiple reasons.  Clearly the need to move is important.  What is key here is that the movement is not just a "brain break" but is instructional!  Movement is linked with learning.  Yes, this is important for boys because of high activity levels, but also needed for girls because it is just good teaching!
 http://www.edweek.org/ew/articles/2011/07/13/36read.h30.html?tkn=LVRFWBCXg3ZGEFsx4ABylh%2F5%2Fmj8hvsUta9D&cmp=ENL-TU-NEWS2