Exercise videos showing how to perform a Plank.
The individual places the toes and the forearms on the ground, with the elbows underneath the shoulders and the arm bent at a 90-degree angle. This position is maintained for as long as possible.
The Static Push Up variant simply holds the starting position of a Classic Push Up for as long as possible.
The S&M Push Up variant builds on the Static Push Up variant, but opposite legs and arms are lifted from the ground. The position is held as long as possible before switching sides.