This is Ahmed Kerigo and he does crazy push-ups. Clearly.
He calls that one a flying push-up. According to the YouTube information, those boxes are stacked 1.36 metres, or nearly four and a half feet high. Here's another version on a slightly smaller stack of boxes.
And more.
I swear, if I see one comment like "technically that's not a real push-up" or something equally ridiculous, I will turn this car around.
[reddit]