Hitting the deck and casually knocking off perfectly strict one-arm pushups—not the twisted ugly reps that pass for OAPs in most circles—never fails to impress. A total zero-to-hero progression to this classic feat is right here, at your fingertips.
As a bonus, the strength gained will totally carry over to any pushing motion—pressing a kettlebell or a barbell, keeping a lineman at bay in football, you name it.