Push-ups. Or rather, anything involving upper body strength. This was re-inforced today at club volleyball practice when my coach told us to do two minutes of suicides (this went well), 50 sit-ups (again, no sweat), a minute of planking (not too bad), followed by fifteen push-ups.
Needless to say, if people didn’t know what I was doing, they probably would have thought I was, or at least attempting, to eat the floor.