Just because something is (or seems) effortless to others

My favorite part of skate videos growing up was at the end when they showed all the wipeouts and crashes. They hurt to watch, so much, but they always drove home the fact that it took a lot of painful and frustrating failures before the guy landed that really smooth 35 stair grind.

The point it, things often seem effortless to others but that's just cause you're not really seeing the effort being put in.