Imagine you running around and all of a sudden you see Athletics Skill Increased.
What do you think life would be like?
You'd be able to make a fortune as a cliffracer exterminator.
You'd only be able to gossip with half the population.
Guards would become the #1 cause of death within cities.
If you touched anything that was not inside of your house, one of those guards would instantly appear near you and attempt to arrest you.
Riding a horse up a hill would be damn near impossible.
The fishing industry would consist of giant crabs, killer fish, and mermen.
There would be a surprising amount of ruins, crypts, tombs, mines, and caverns scattered throughout the countryside, all of which would be inhabited by clones with the occasional bandit.
Taverns would become eerily quite on the outside, yet be full of people.
Windows would stay lit regardless of what the time is outside the building.