HOW: Begin in a high plank position making sure your shoulders, hips, knees, and ankles are in a straight line with resistance and around your feet. Keep your core engaged then lift one leg up and drive the knee towards your chest. Return and repeat with the other side.
FEEL: You will feel your core work primarily with this exercise. Your shoulders and hip flexors will also be working throughout this exercise.
COMPENSATION: Avoid arching or rounding the back as you perform this. Maintain a neutral spine by keeping the core engaged.