Vitality as Aptitude

You improve familiarity with your own body and its memories.

The Way It Serves

How one may find themselves using Vitality to manifest what they find ideal.

Tending to self or others' physical needs.
Retaining physical sensations.
Building physical mass and endurance.
Reminiscing on past experiences.
Rebuilding and reliving sensory moments.

And if these are traits you can't help but to do even since childhood, and most importantly, produces a form of joy, it's safe to say that it's an aptitude you possess.