GoNoodle plays different videos that you can use for Brain Breaks. Some of the activities are energizing, some are calming, and some are learning-based! My students loved the "Freeze It" game where they converting mixed numbers to improper fractions!
My students also loved choosing the Brain Breaks on GoNoodle. I always let my Leaders of the Day choose the Brain Breaks for that day, and if we wanted to do more I just pulled a popsicle stick! If you haven't checked out GoNoodle...do it! You can even search by grade level, activity, etc.!