major groups of cell

• The pectorals or PECS are the large chest muscles.
• The pectorals ARE full of thick muscle fiber and add bulk to the upper body.  
• The pectorals provide support when you hold objects in front of your body, and they are activated when you reach across your body.
• Pectorals are the only chest muscle.
• Latissimus Dorsi  is a large, flat muscle on the back that stretches to the sides, behind the arm, and is partly covered by the trapezius on the back near the midline.
• Latissimus Dorsi  is called as “LATS” or the “WINGS”.
• The rhomboids are located in the upper back.
• the rhomboids are underneath the trap muscles and not visible from outside.
• romboid muscles can’t be seen but they play a vital role in strengthening the scapulae and all the back movements.
• . Trapezius Also known as, THE TRAPS, that are located between shoulders and the neck
• The traps can further be classified into three divisionsthe upper traps, middle traps, and the lower traps, with the lower traps extending as low as the lower back.
• Teres Muscle lies underneath the ‘lats’
• teres muscle works with the lats as well as the rotator cuffs.
• Exercises like single-arm lat pulldowns and pullovers target this teres muscle directly.
• The erector spinae or spinal erectors is a set of muscles that straighten and rotate the back.
• erector spinae are actually deep muscles that help to extend the spine and are key in posture. 
• the back muscles are latissimus dorsi, rhomboid, trapezius, teres muscle and erector spinae.
• Biceps is found in the front of the upper arm
• biceps help control the motion of both the shoulder and elbow joints.
•  At the elbow, the biceps are essential in lifting, and at the shoulder, they help with moving the arms sideways, forward and upwards. 
• •       biceps helps bend or curl the arm toward your body.
• The triceps are muscles in the back of the upper arm
• triceps help stabilize the shoulder joint and allow the elbow joint to be straightened.
• The triceps are utilized in passing and shooting a basketball, and help with finite movements such as in writing, drawing or even push and pull.
• The deltoids, or delts, are known as the SHOULDER MUSCLES.
• deltoid is used on all side of body lifting motions.
• deltoid provide support when you carry things and help keep carried items away from the motion path of the thighs.
• The deltoid muscle consists of 3 parts: anterior deltoid, medial deltoid, and posterior deltoid.
• the arm and shoulder muscles are biceps. triceps and deltoid.
• Obliques are muscle group on the sides of the abdominals are the obliques. 
• Movement of obliques muscles may result in several actions, but they are best known for their lateral flexion and rotation of the trunk known as a SIDE BEND
• One of three gluteal muscles, the gluteus medius connects the ilium to the top of the femur.
• Gluteus maximus areThe largest and outermost muscle of the buttock, the gluteus maximus attaches to several places in the pelvis and thigh
• Gluteus maximus allows you to extend your upper leg, spread it, and turn it outward.
• Gluteus medius controls the level of the hips and allows the thighs to rotate.
• Serratus anterior is a group of muscles connected to the rib cage, which help stabilize the shoulder.
• Psoas major are the muscles connect the lower part of the spine to the ilium and the femur and aids in flexing the hips.
• the abdominal muscles are obliques. Other important abdominal muscles include gluteus medius, Gluteus maximus, serratus anterior, and psoas major.
• The hamstrings are the huge muscle group in the upper back part your thighs
• Hamstrings main function is to bend your knees and help propel your body forward in such activities as walking, running,  jumping, or doing a Krav Maga kick.