This page lists the pros and cons of having recess time in schools, and it also shows different things that schools could do to fix problems with recess. But since those solutions are listed, this page is obviously extremely biased towards having recess, and that makes it hard to use, but since the actual problems in the con side of the list match what we've previously found, then it is reliable and can be used.
This article shows a few reasons why recess is getting cut from schools, but it seems to be biased for the side to wanting recess since it also shows parent objections.It would still be good to use since the information given is still good.
This article lists the different reasons why recess is advantageous to kids and why recess should continue to be a thing. It seems biased to the side of recess being advantageous, but it is still good since the author is a children's physical activity specialist.
This is a paper about the different ways that recess is advantageous to developing kids and how the lack of adequate recess or break time is bad for young students. It is biased towards the advantages of recess, but it would be good to use since it has many facts and statistics.
This short paper shows different advantages of a recess to students and the disadvantages to the schools of still having it, such as a reduction of extra energy, or having possible legal problems if a child gets hurt. It doesn't have any bias that I could see since it gives equal thought to both sides of the argument and backs them both up strongly. This makes it a good source since the lack of bias leaves more fact than opinion.