Most people associate plank as an ab and arm exercise, but a lot of the work in plank occurs in your shoulders and upper back. This is a great pose to do in front of a mirror to make sure you are maintaining proper alignment.
- Lie on stomach, plant palms flat on the floor, and align elbows with shoulders. Slide shoulder blades back and down, lift torso, hips, and legs off the floor with toes engaged on floor. Maintain a neutral spine, and engage abs and ribs. Keep head aligned with spine looking in between hands.
- Hold 30-60 seconds, and repeat one more set.