Teaching children the difference between tattling and telling is often an overlooked playground skill that children should  be taught.  Taking a couple of minutes to distinguish the difference will have a positive impact on the playground.  Explain to children:
Tattling is when you are trying to get someone "in" trouble.

Telling is when you are trying to get someone "out" of trouble.

Even the youngest children understand this important distinction.  Kids understand that telling is when they report,  "Johnny needs help he fell off the swing."  And tattling is when a child reports, "Jenny is chasing after Jimmy."

The exception is bullying.  Anyone who observes a bullying incident  should report it  to an adult. 

A well established strategy in addressing the childhood obesity crisis is to start with schools.  (After all the majority of children attend schools daily.)  But the results of a new national survey shows that only 16% of elementary schools, 13% of middle schools and 6% of high schools are offering before, during, and afterschool physical activity opportunities according to an AAHPERD report released last week.

It seems that a practice of withholding recess is on its way out.  Almost one-third of elementary schools (31%) have a policy or practice that prevents recess from being withheld as a behavioral consequence or form of punishment(PP article). In nearly two-thirds (61%) of elementary schools, integration of physical activity in some classrooms occurs between lessons (56% of schools), during lessons (44% of schools), and at the start of the day (43% of schools).  Let's Move in School Survey Results.