You should not feel pressured to mark only academic / medically-related / "why medicine" activities as your most meaningful.. you may miss out on showcasing other positive qualities in your application.
Personally, I'm a fan of being explicit in these descriptions (essentially some form of "through activity A, I learned X and Y") because I recognize that I'm a piss-poor writer and am risk-adverse. By being explicit, I ensure that the reader will at least know i) why the activities were important to me, and more importantly, ii) what I gained from the experiences. The latter will demonstrate introspection and implicitly tie back even non-medically-related activities to medicine by identifying qualities that I believe are important for personal and professional growth.
In the end, you only get credit for what the reviewers pick up on, and it's not their job to make connections on your behalf or to guess what you learned from your experiences. So imo, there's nothing wrong with being explicit so long as it's done with humility and some common sense. Help them help you !