Exercise videos are from Sworkit: https://www.sworkit.com
Sworkit offers a variety of fun kids workouts that are free for anyone.
If you are a teacher and would like to create custom workouts for your students, go to:
Under this initiative, any teacher with a K-12 classroom, anywhere in the world, can get free access to Sworkit’s paid subscription service (available on Android, iOS, and the web). Teachers will have unlimited access to the extensive library of workouts.