(A) Plank Up Down
Start from an elbow plank position. Brace your core hard and place your right palm on the ground as if you are about to do a pushup, now place your left palm on the ground as if you are going to do a push up. Push your body up until you are in push-up plank position. Continue your strong core brace and lower yourself back to the starting position. That is 1 rep. Repeat until you are fatigued. Remember, this is an advanced move so be sure you can maintain a good strong core brace through the entirety of the movement.