Clark takes the lesson in stride, which he would want to, having invited it. Sure, it amuses him to do so, and he can't be certain Bruce is likewise entertained, but he listens. Does as instructed. Pays attention to what his body is doing in the slow motion, freeze frame version of what he does naturally.

Taking a step back, he swings through at a normal human speed-- well, mostly. Perhaps it's a touch faster than it ought to be, but his form is better. His fist moves through the air like a mallet, wind rush and all.

"I never practiced," he says. It's not bragging, about how he never has to, about how little effort it is to be Superman. It's not really self-pitying, either, about his own necessary acts of restraint throughout his average life, but probably closer to this second thing than the first.

Mostly, it just is.

"Guess I could get into the habit."