The quadratus lumborum muscle is a commonly overlooked source of low back pain and is often responsible for “pseudo disc syndrome”. This muscle originates on the inferior border of the 12th rib and lumbar transverse processes. It inserts on the iliac crest and iliolumbar ligament. The q.l.’s main actions are extension and lateral flexion of the spine. It also acts as a stabilizer of the lumbar spine. Trigger points in this muscle refer pain into the sacroiliac joint and the lower buttock. Pain can also spread anteriorly along the crest of the ilium into the lower abdomen and groin and to the greater trochanter. 
Repetitive Stress Injury
Why Posture Is So Important For Fitness
Why Posture Is So Important For Exercise & Fitness
Great article from http://www.brit.co on posture and fitness.
If you’ve ever rolled your eyes when your mom told you to “sit up straighter,” listen up! Turns out she was on to something. Good posture is important for more reasons than physical presentation. And for fitness fanatics, it’s actually critical. “Good posture impacts how you walk, jump, and lift,” says Aaptiv trainer Ackeem Emmons. “Proper alignment also eases strain or pain on your spinal cord.”
For runners and gym-goers, the impacts are even more specific. “When you’re running, having good posture allows you to breathe better,” Emmons says. “The more air in your diaphragm, the further you can go. The better your posture, the more fluid your form.” All of this translates to more efficient and successful running. In the gym, proper form and alignment help you isolate certain muscle groups and execute heavy compound movements, he adds.
Beyond the obvious physical gains, your posture can also impact you mentally as well. “Standing tall with proper posture gives the immediate impression of confidence and courage,” says Aaptiv trainer Ceasar F. Barajas. “You’re mentally setting the tone for success when you straighten up a bit.”
If you’re suddenly feeling hyper-aware of your spinal column, don’t worry. According to Aaptiv trainers Jaime McFaden and Benjamin Green, you can work every day to gradually correct limp posture. “Sit up straight and gently pull your shoulders back and down, stretching the neck. Press both feet firmly into the ground and lift your chest,” McFaden says.
“I’m on a bike anywhere from three to six days per week, hunched over with a rounded back,” explains Green. “Throughout the day, if I catch myself not standing up straight, I open up my shoulders.” If it helps, imagine a string attached to the top of your head, pulling you up, he adds.
For those looking for a more intense posture intervention, our Aaptiv trainers shared five exercises and poses that will help open up your chest, align your spine, and gradually correct poor posture. Keep reading for more moves and be sure to check out all of Aaptiv’s yoga and stretching classes in-app to support (pun intended) your good posture journey.
1. Planks — Aaptiv Trainer Kelly Chase: Lie on your stomach with your legs straight behind you. Bring your arms forward and rest your weight on your forearms. Your elbows should be directly below your shoulders. Your arms can rest straight and flat with your palms facing the ground or you can bring your hands together to form a triangular shape. Engage your core and keep your body as straight as possible, careful not to create any dip or arch in your lower back. Hold for 30 seconds. As you become stronger, you can increase your hold time.
2. Band Scapular Retraction Rows — Aaptiv Trainer Candice Cunningham: You’ll need a resistance band for this exercise. Sit upright on the floor with both feet extended in front of you. Keeping your legs straight together, wrap the band around the bottoms of your feet, holding the ends in your hands. Focus on holding your back completely straight as you gradually pull the ends of the band into your chest in a row-style movement. Your elbows should bend out to the sides at chest height. Straighten your arms and repeat.
Complete 10 reps.
3. Supermans — Aaptiv Trainer Benjamin Green: Lie straight and face down on your mat. Extend your arms in front of you with your biceps next to your ears. Exhale and simultaneously, raise your legs, arms, and chest off the mat, creating a U-shape in your body. Squeeze your lower back and hold for two deep breaths. Inhale and lower your limbs back to the mat.
Complete 10 reps.
4. Bird Dogs — Aaptiv trainer Ackeem Emmons: Start on your hands and knees with your palms directly below your shoulders and your knees below your hips. Put your weight on your left knee and left hand as you slowly lift your right leg and straighten it behind you, keeping it in line with your flat back. Lift your right arm and extend it forward in line with your back. Reach with your fingers, careful to maintain a straight line through your body from fingertips to toes. Flex your right foot so your toes are pointed toward the ground and hold for five deep breaths. Repeat on the other side.
Complete 10 reps on each side.
5. Tadasana (Mountain Pose) — Aaptiv trainer Ceasar Barajas: You can perform this pose standing or sitting (at your desk perhaps?). Take a deep breath in and roll your shoulders up towards your ears. Exhale and roll them back down. Continue consciously breathing deeply and engage your core. Imagine someone poured cold water down your back to further engage your core and move deeper in the stretch.
Perform this move as often as you need.
Trigger points in the temporalis muscle
The temporalis muscle is located in the temple area of the skull. It originates on the temporal lines on the parietal bone of the skull, and inserts on the coronoid process of the mandible. It’s main action is to close the jaw. The posterior and middle fibres bilaterally retrude the mandible. Acting individually, this muscle will deviate the mandible to the same side. Trigger points in this muscle refer into the teeth causing hypersensitivity, and into and above the eye and temple, causing headaches.
Exercise of the Month
Here is a great exercise that targets those upper back and shoulder muscles.
Reverse Butterfly’s – Keep in mind that all of the work in this exercise is done by your shoulder blades. Your arms are just along for the ride.
Trigger points in the lateral pterygoid
The lateral pterygoid muscle plays an important role in prober jaw function. It originates on the greater wing of the sphenoid bone and the lateral pterygoid plate, and inserts on the condyloid process of the mandible. It’s action is to pull the head of the mandibular condyle out of the mandibular fossa while opening the jaw. When trigger points develop they refer pain into the temporal mandibular joint and maxillary sinus. This referral is commonly mistaken for TM arthritis. In addition to the referral pain, trigger points in this muscle can also effect proper movement of the jaw.
Trigger points in the serratus anterior
The serratus anterior muscle is located along the sides of the ribs. It originates on the outer surface of the upper 8-9ribs, and inserts on the medial border of the scapula. This muscle acts on the scapula in several different ways. First it rotates the scapula to turn the glenoid fossa upward. It also protracted and elevates the scapula. And lastly it helps to prevent wining. This muscle is often shortened from prolonged sitting and work on a computer. Active trigger points in this muscle refer pain locally around the trigger point with spillover down the inside of the arm. Pain can also radiate into the inferior angle of the scapula. 
Trigger points in the iliopsoas muscle
This muscle originates on the bodies and disks of T12-L5 and the inner ilium. It inserts on the lesser trochanter of the femur. The psoas flexes the hip when the spine is fixed. When the leg is fixed it extends the lumbar spine increasing lumbar lordosis. This Muscle is often chronically shortened due to inactivity and sitting posture. When trigger points are present they will refer pain primarily to the lower lumbar area and the sacrum as well as into the anterior thigh. Trigger points in the iliopsoas muscle can mimic appendicitis.
Trigger points in the piriformis muscle
The piriformis muscle is a small muscle deep to glute max and lies over top of the sciatic nerve. It originates on the anterior sacrum, and inserts on the greater trochanter of the femur. It’s main action is to laterally rotate the femur. When trigger points developed in this muscle they will refer pain into the sacro-iliac region, across the posterior hip and down the leg. This muscle can also be a cause of sciatic nerve irritation if it gets tight, causing “sciatica” symptoms. 
Trigger points in the gluteus minimus
The gluteus minimus is a small but important muscle that lies deep to the gluteus medius. It originates on the gluteal surface of the ilium, and attaches on the greater trochanter of the femur. It’s main actions are to abduct and medically rotate the hip. Trigger points in this muscle refer pain into the buttock and down the lateral and posterior leg, mimicking sciatica. This muscle should be the first to be examined if a straight leg test turns out negative. 
Trigger points in the gluteus medius muscle
The gluteus medius muscle plays an important role in hip and pelvic stability. It originates on the gluteal surface of the ilium, deep to the gluteus Maximus. It inserts on the greater trochanter of the femur. It’s main actions are to abduct the hip and to assist in internal rotation of the hip. It also maintains pelvic stability during walking and running. Trigger points in this muscle will refer pain into the sacrum, the iliac crest, and down the lateral hip and into the thigh. This muscle is often a cause of lower pack pain.
Aberdeen Chiropractic 