Longer lesson times need to ensure the students are getting up and moving for both their physical and mental health.
Students are easily distracted, but regular, short breaks can help them focus, increase their productivity, and reduce their stress.
Research has clearly shown that brain-breaks are likely to increase student engagement. If you want to know more about the neuroscience of brain breaks read this Edutopia article.
Jarrod's brain break during a Geology lesson on rocks!
Here are some examples of brain breaks that are scattered through slide decks in Pennys' lessons on Waves. Each 105 minute lesson has two brain breaks.
Tim's brain break was to take the students for a walk around the oval. He carefully cued student behaviour to ensure the students were quiet and sensible and didn't disturb other classes.