Plank hip dips! Ready to add more challenge to your basic plank? Try hip dips! What is a plank hip dip?‌ It's a core exercise that involves dipping your hips to one side at a time in a forearm plank to target your obliques-the muscles that run along the sides of your abdominals. The plank hip dip strengthens your back, transverse abdominis (your deepest internal abdominal muscle) and obliques, and strains the stabilizer muscles of your shoulders — which is vital to good posture. A plank hip dip