Under the muscle trough from the sides of the body are serratus anterior. From the back of the shoulders to the waist on the sides of the torso are latissimus dorsi, which cover the entire back. To see them, stand sideways to the mirror. 
Pull the belly and tighten it. You'll see three rows of muscles that perform different functions: bend the torso forward, raising his legs from a prone position, etc. On the sides of the abdomen are long muscles running from the chest to the pelvis. This obliques, they turn the body from side to side, tip and straighten it. 
On the front of the thighs are seen bigger muscles extensor tibia in the knee joint.Muscles of the back of the thigh, called the flexor leg bent leg at the knee. You will feel their arm by putting his hand on the back of the thigh and bend your knee. 
On the calf is gastrocnemius, bending and straightening, that returns the foot. 
Training of relevant muscle groups - the neck, back, legs, etc. - will help to achieve a harmonious development of all parts of the body, to correct deficiencies, if necessary physique. 
EXERCISES FOR THE NECK MUSCLES 
By the neck muscles are sternocleidomastoid neck muscle and its antagonists - extensors of the neck (neck muscles)