Term in English for short physical exercise in the middle of a lesson - Физкульминутка

Solution 1:

I’m not aware of any established term, but “(short) exercise break” is a clear term that needs no definition. Here are some examples in use:

• Classroom Exercise Breaks for Elementary Students

• One to two exercise breaks, held daily in school, will contribute significantly to the goal of a total of 30 minutes of activity each day for every child. — Active Breaks (download)

• Short exercise breaks during class improve concentration

Alternatively, I have also seen the following used, less commonly:

• Movement break
• Fitness break (seems to indicate a bit more rigor)
• Physical activity break (a bit wordy and slightly formal)

The term “brain break” is close but the activities it covers don’t all involve exercise (such as mindfulness).