Ok ok so they removed athletics and acrobatics to prevent people just jumping up and down to increase acrobatics, and because athletics just increases by itself, which I am totally in agreement with, those skills should totally be perks
HOWEVER
How did one increase sneak?
By going into sneak mode, pointing yourself at a wall, pressing Q, going to eat lunch etc etc...ok now you didnt have to do that, but honestly if you wanted it to really really go up...gaa you see what I mean? How have they fixed this!!!
You can use this argument for a LOT of skills.
How did one increase armor? Find some rats, AFK.
How did one increase Restoration? Do it alongside the armor method using a Restore Health spell strong enough to keep you alive and weak enough that magicka regen covers the cost, then hold the button down and AFK.
How did one increase any non-Destruction magic school? Do the same thing.
Block worked the same as Armor.
The point is, you have to choose to do all of these things. You have to choose to fight in armor, or sneak, or cast spells. You had to choose to jump for the most part, but you did not choose to run. You leveled Athletics whether you wanted to or not. With the new leveling system, where all skills count toward a level, you're gaining levels whether you want to or not as well.