PE is as permanent as anything else, it’s not like you live forever with this body. You’re muscles fade, you’re body ages, hell you even lose height when you age.
When you stop lifting weights, you lose muscle mass, right away. So therefor weight lifting isnt permanent. How many pictures of old people have you looked at, and when they were young they had muscles and were fit. Did you draw the conclusion, well weight lifting isnt permanent!
Hell PE seems to be more permanent than body building. With body building you get to a certain age and even if you wanted to continue, you’re joints and bones wont let you. There is nothing stopping you from doing PE well into you’re old age.
So therefor PE is more permanent than body building.