It is the fascia found on the last 6 Thoratic vertebrae. It is part of the origin of the Latissimus Dorsi.
Pull-ups primarily target the latissimus dorsi muscle group in the back, though many other muscles are involved in the movement. These assisting muscles include the brachialis, brachioradialis, biceps brachii, teres major, deltoid muscle, infraspinatus, teres minor, rhomboids, levator scapulae, trapezius lower, trapezius middle, and pectoralis minor.
There is a lower back muscle called the latissimus dorsi and your deltoids and trapezius make up your upper back. The deltoids are on your shoulder and your trapezius is the muscle on the back of your neck.
latissimus dorsi...the lats are from the lowest part of the back and attach on the front of the humerus (upper arm bone)Source(s):exercise science majorBiology online
The biggest muscle in the human body is the gluteus maximums (the buttock muscle). This is in the buttocks keeps us standing upright and fights against gravity when we walk up stairs.
The part of the body that is below the armpit towards the back in the chest area is the latissimus dorsi muscle, commonly known as the lats. These muscles are responsible for movements like shoulder extension, adduction, and internal rotation.
Very often lower back pain is a part of pregnancy. But if you just have lower back pain, it doesn't necessarily mean you are pregnant.
If its is an overhand pull up then its is the upper back muscles and the forearms. If it is an under hand pull up then it is mainly the biceps.
Usually a sharp pain in the lower right part of the abdomen.
See a doctor. Do not rely on public opinion for your health.
appendicitis
Adduction means to move a body part towards your body's central axis. When adducting an upper limb, which is defined as the area between your deltoid and your hand and including the arm, axilla, and shoulder, the following muscles are used: trapezius, pectoralis minor, rhomboideus, latissimus dorsi, coracobrachialis, flexor carpi, and extensor carpi ulnaris.