HOW: Start in a plank position with your forearms on the ground, legs straight out, and toes pushing into the ground. Keep your core stable as you shift your weight to one side and just barely tap the front of your hip to the ground and do the same for the other side. Alternate shifting your weight to each side.
FEEL: You should feel your core muscles working.
COMPENSATION: Control shifting your weight to each side, don’t flop down.