A beat change is the change in tone of voice to set up new ideas.
Find a piece of copy you like that's not too long. It can be a commercial or short descriptive narrative.
It should have at least four Beat Changes/Change in directions in the copy...places. that require beat changes:) Record yourself and vary the cadence to set up clear Beat Changes. Try and create 20 versions that are more related than not. Yes 20 versions. This creative exercise will help develop control over the voice and tone of voice as well as improve creativity.