Here are some great resources that I have used in my classroom for different movement breaks: 

https://www.gonoodle.com/  

- This website has awesome movement break ideas that my students love! There are dancing videos, yoga videos if you want calm movement breaks and even some counting songs! 


http://standupkids.org/movement-break/

- This website provides specific movement breaks that are more like PE activities 

I also use a lot of youtube as a way to find movement break videos. This way I can do something different with my students each time and keep it engaging for them :)