Exercise

The video likely performed well due to its educational content about brain health and exercise, presented in a concise and engaging format. The use of a relatable question about social media's impact also likely resonated with viewers, prompting discussion and shares.

The speaker explains that exercise is a potent stimulus for brain health, Alzheimer's prevention, and cognitive reserve, leading to a larger brain. When asked if scrolling social media improves cognitive reserve, the speaker implies it has the opposite effect.