Clenching and unclenching your buttcheeks as if there was a Mars Bar jammed inbetween them. This is to ensure you keep the blood flowing when standing still for a long period of time.
Instructor: To keep the blood flowing don't forget to eat a Mars Bar. Don't fully eat a Mars Bar, and don't produce a Mars Bar.
by jentlemangack December 4, 2020
Get the Eat a Mars Barmug.