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BeginnerChestMachineIsolation

Pec Deck (Machine Fly)

A machine isolation exercise for the chest that provides constant tension throughout the range of motion.

Pec Deck (Machine Fly) demonstration

Visual demonstration — Pec Deck (Machine Fly)

Muscles Worked

Pectoralis Major (Primary)Anterior Deltoid

Step-by-Step Instructions

  1. 1Sit on the pec deck machine with back against the pad
  2. 2Place your forearms against the arm pads
  3. 3Bring the pads together in front of your chest
  4. 4Squeeze your chest hard at the peak contraction
  5. 5Slowly return to the starting position

Training Recommendations

Strength
Sets3-4
Reps6-8
Rest90-120 sec
Hypertrophy
Sets3-4
Reps10-15
Rest60-90 sec
Endurance
Sets2-3
Reps15-20
Rest30-45 sec

Tips & Variations

  • Keep a slight bend in your elbows
  • Don't let the weight stack touch at the bottom
  • Focus on squeezing the chest, not pushing with arms

Common Mistakes to Avoid

  • Not using full range of motion
  • Letting weights crash at the bottom
  • Rounding shoulders forward

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