Hi Alexandra, Active and passive is similar to pinch and stretch. Imagine taking a pillow and folding it in half. The outside would be the stretched / passive side, and the side folded on itself would be full of pinches and wrinkles, the active/pinched side.
However, active and passive is not limited to pinch and stretch, it can be thought of as which side has more action, or corners or movement. In his demo, he has a relaxed arm that is passive and and an upright arm holding something that is active. In this case its pretty literal, the active arm is being flexed, its actively doing something, but it also has more lines and corners than the passive side.
I hope this helps 🙂
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