Brain breaks are simple physical and mental exercises. They have a positive effect on learning by:

• increasing engagement and cognitive functioning
• supporting the brain maturation process
• enhancing focus, mood and learning
• increasing students’ perceived competence
• improving classroom behaviour
• strengthening teacher-student relationships.

Furthermore, if the brain breaks are physical, they have the additional benefits of:

• increasing circulation
• increasing the oxygen in the bloodstream which leads to improved concentration
• allowing the students to get out of their chairs
  
  https://education.nsw.gov.au/teaching-and-learning/learning-from-home/wellbeing/wellbeing-at-home/general-information/brain-breaks