Ariel_yu on Instagram: "The plank is a highly effective core training exercise. To perform it properly, keep the following key points in mind: 1. Place your hands naturally forward on the floor. This helps reduce pressure on the shoulders and prevents the elbows from tucking in too close. 2. Keep your head aligned with your spine. Look down at the floor-avoid tilting your head up or down to maintain a neutral neck position. 3. Protract your shoulder blades. Don’t pinch them together-keep them sl