The kind of stretching I'm referring to is the sort some schools make their kids do at morning assembly. Skip through parts of this video to get a general idea. https://www.youtube.com/watch?v=j-uadHt_oyM
In a nutshell, the stretching involves standing with feet shoulder width apart and moving your arms up/down/around. So doing this with weights seems like a dynamic version of holding your arm straight out with a heavy weight (known to be a good shoulder workout).
Is there a benefit to doing these with a weight in either hand. Has anyone done this?