Biomechanics: Shoulder Press

Agonists:   Anterior & Medial Deltoids  (shoulder flexion & abduction)
Synergists:  Upper Trapezius  (scapular elevation)
Stabilizer:   Rotator cuff
Antagonist:  Latissimus dorsi  (shoulder extension)

Example

Biomechanics: Squat

Agonist:   Gluteus Maximus (Hip Extension), Quadriceps (Knee Flexion)
Synergist:  Hamstring Complex
Stabilizer:   Transversus Abdominis  (ab pressure)
Antagonist:   Psoas (Hip Flexion)

Example

Biomechanics: Row

Agonist:   Latissimus Dorsi  (shoulder extension)
Synergist:   Posterior Deltoid (shoulder extension), biceps (elbow flexion)
Stabilizer:  Rotator cuff
Antagonist:   Pectoralis major  (shoulder flexion)

Example

Biomechanics: Overhead Press

Agonist:  Anterior Deltoid (shoulder flexion)
Synergist:   Triceps (elbow extension)
Stabilizer:  Rotator Cuff
Antagonist:  Latissimus dorsi (shoulder extension)

Example

Biomechanics: Chest Press

Agonist:   Pectoralis Major   (horizontal shoulder abduction, shoulder flexion)
Synergist:   Anterior deltoid (shoulder flexion), triceps (elbow extension)
Stabilizer:   Rotator cuff
Antagonist:   Posterior Deltoid   (shoulder extension)

Example