Condescending Army term for telling someone to do push-ups.
Its usually used by a higher-ranked person toward a lower-ranked person for punishment. Wouldn't usually be used during PT, you'd tell someone "beat your face" if you caught them red-handed doing something stupid.
Rarely used by officers when dropping a sergeant for push-ups because of its condescending tone, its almost exclusively directed toward lower ranked enlisted when they fuck up.
Platoon Sergeant: What the fuck are you doing walking around outside without your cover (hat/beret) on you dipshit?
Soldier: Uh... uh... no excuse sergeant?
While our lifespan is the number of years we will live, our healthspan is the number of healthy years we will have and our sexspan is is the number of years we will continue to be healthy enough to continue having an active sex life.