Muscle opposites and functions

Pectoralis Major (opposite)

Latissimus Dors

Biceps (opposite)

Triceps

Rectus Abdominus (opposite)

Erector Spinae

Quadriceps (opposite)

Hamstrings

Biceps (function)

Flexion at the elbow

Triceps (function)

Extension at the elbow

Pectorals (function)

Pushing motion

Latissimus Dorsi (function)

Pulling motion

Rectus Abdominus (function)

Flexion at the waist

Erector Spinae (function)

Hyperextension at the waist

Hamstrings (function)

Flexion at the knee

Quadriceps (function)

Extension at the knee

Gastrocnemius (function)

Extension at the ankle

Obliques (function)

Lateral flexion and rotation of the trunk

Trapezius (function)

Elevation of shoulders & assists in pulling motions

Deltoids (function)

Flexion, extension, & abduction of the shoulder

Gluteus Maximus (function)

Extension of the hip