Your breathing and your heartbeat are coupled: the pulse speeds up slightly on the in-breath and slows on the out-breath, and slow paced breathing calms both. Use the guide below to breathe at a set pace, then measure your pulse by hand (two fingers on the wrist or the neck) and log the numbers under different conditions, for example at rest, after slow music, and after fast music.
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What to notice: for most people a few minutes of breathing at 4 to 6 breaths per minute visibly lowers the pulse, and lively music nudges it the other way. The differences are small, so count carefully. This is a classroom exercise, not a medical measurement.