It's bizarre to me that whoever captured that excerpt edited in a close-up of his hands when he does that leg slap, when it's not that way in the original clip at all:
Such a random extra bit of effort lol. And while we're at it, here's some more clips! He had plenty of Clark energy in Hollywood:
Here's one with fellow Superman Darren Criss -
A more romantic scene with an Almost Lois, Samara Weaving -
And lest anyone be worried he can ONLY do that nervous Clark Kent energy, here's some laid back, calming, confident zen energy to counter:
Note the
completely different body language in the two roles. He's got this. Boy could do it in his sleep.