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Major Muscle Groups. Deltoid. Forms the rounded contour of the shoulder 3 Parts: Front portion Middle Portion Posterior Portion Movements: Middle Portion abducts the arm at the shoulder

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Major Muscle Groups

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major muscle groups

Major Muscle Groups

  • Forms the rounded contour
  • of the shoulder
  • 3 Parts:
    • Front portion
    • Middle Portion
    • Posterior Portion
  • Movements:
    • Middle Portion abducts the arm at the shoulder
    • Posterior portion laterally rotates and extends the arm at the shoulder.

deltoid movements
Deltoid Movements

  • A thick muscle

that covers

the anterior

(upper front)

part of the chest

pectoralis movement
Pectoralis Movement
  • Types of movement:
    • Transverse Flexion
      • moving the upper arm toward and across the chest with the elbows facing out to the sides
    • Transverse Abduction
      • moving the upper arm away from the chest with the elbows facing down
    • Internal
      • turning the upper arm inward
    • Adduction
      • moving the upper arm down to the side toward the body
    • Extension
      • moving the upper arm down to the rear
how to strengthen pectoralis muscle
How To Strengthen Pectoralis Muscle

  • muscle located on the

upper arm

  • Is tri-articulate, meaning

that it works across three joints

    • Shoulder joint
    • Elbow joint
    • Proximinal-radioulnar joint

how to strengthen biceps muscle
How To Strengthen Biceps Muscle
  • Can be strengthened through resisted elbow flexion, aka a curling motion
rectus abdominis
Rectus Abdominis
  • extends from front of the ribs

to front of the pelvis

  • Main job is to flex the spine


  • Well known “6-pack abs” comes from a very strong rectus abdominus

rectus abdominis movement
Rectus Abdominis Movement
  • Major movement of the rectus abdominus is flexion of the spine

external obliques
External Obliques
  • three of them on each side of the

rectus abdominus

  • allows the trunk to twist, but to

the opposite side that the muscle contracts (unique characteristic of that group of muscles)

  • assists with exhalation
  • supports the organs inside the body cavity

external oblique movement
External Oblique Movement

how to strenghten external obliques
How To Strenghten External Obliques

Side Rotation Crunches

Torso Twist

  • Includes the four major

muscles on the front of the

thigh (quad=4)

  • Is the extensor muscle (muscle that opens a joint) of the knee
  • Is crucial for walking, running, squatting, and jumping

quadricep movement
Quadricep Movement

  • A large superficial

muscle on the back

  • Controls shrugging the shoulders up and down, and drawing the shoulder blades together
  • Strain on trapezius is often the cause of lower neck pain

trapezius movement
Trapezius Movement

latissimus dorsi
Latissimus Dorsi
  • Triangular shaped


  • Covers the lumbar part

of the back

  • Large muscle that runs along

the back of the upper arm

  • Is an extensor muscle (opens at a joint)
  • Works in coordination with the biceps which are flexor muscles (bends at a joint)

tricep movement
Tricep Movement

gluteus maximus
Gluteus Maximus
  • Makes up shape and

appearance of the buttocks

  • Maintains the trunk in the

erect posture

  • They begin just underneath the gluteus maximus and attach to the tibia
  • Primary function is knee flexion (bringing the heel towards the buttocks)
  • When exercised without being stretched, hamstring injuries (strains, pulls, etc.) are very common

hamstring movement
Hamstring Movement

  • Muscles at the bottom of the leg
  • Function is to stabilize during walking, runing, and jumping

  • Better Health. Abdominal Muscles. 12 June 2006. 13 September 2007
  • Exercise Prescription on the Net. Biceps Brachii. 12 September 2007
  • Get Body Smart 2007. Muscular System. August 2007. 13 September 2007.
  • Loyola University. Master Muscle Database. 16 May 1996. 15 September 2007.
  • Asher, Anne. Back and Neck Pain. “Rectus Abdominus Muscle”. 21 November 2005. 16 September 2007.
  • BetterU, Inc.. Muscular Anatomy. 17 September 2007.