Within Gyms and Libraries, two special intractable will be found. A rack of weights and a shelf of books. Interacting with either will grant you a minor buff to a random skill that relates to that activity.
Working out could grant you additional strength in the form of increased cardiovascular endurance or speed, or allow you to hit with greater force, or take less damage from heights and melee attacks, maybe even jumping higher and using less stamina to do so.
Reading would grant you additional intelligence relating to medical items and terminology, botany and gardening, or mechanical and electrical know-how.
Both of these would be on a long cooldown to prevent rapid grinding, would take a small amount of time to do in a short animation, to prevent the activity and immediately running away afterwords and to make it more risky to do so, and there’s only a slight chance it’d buff a skill, or a guaranteed chance but a really minor buff (Maybe a skill point or do-activity-to-increase-skill reduction of a few points off in a ‘discount’ or after the next three activities you do for a skill it’s a guaranteed increase)
Upsides: It could drastically reduce time spent grinding out certain skills, May make the player slightly overpowered if really good luck is involved.
Downsides: Highly risky, chance it may not even help out after performing the activity. May make other players slightly overpowered if really good luck is involved.