WhatWorksWhat.
Chest

Pec Deck

The cleanest pec squeeze you'll get.

Complexity · Lowhypertrophybeginner+Selectorized machine
  • Chest
  • Chest - Middle (sternal)
  • Front delts
  • Upper (clavicular)
  • Middle (sternal)
  • Lower (costal)

PrimarySecondary

What it hits

Parts of the target muscle.

  • Upper (clavicular)

    Not hit

    Targeted on incline pressing/flys.

  • Middle (sternal)

    Hit

    Targeted on flat pressing.

  • Lower (costal)

    Not hit

    Targeted on decline pressing and dips.

The movement

Get it right, not roughly right.

Optimal form

3:03· Colossus Fitness

How to PERFECT The Pec Deck | (CHEST FLY MISTAKES & TIPS)

Stretch

Squeezed

Adjust seat so elbows or hands align with mid-chest. Bring the pads together with a squeeze at the middle. Slow eccentric - 2–3s.

Common mistakes

  • Letting the arms snap back at the end of the rep - shoulder hazard.
  • Going too heavy - turns into a partial-ROM swing.

Where you should feel it

The cleanest pec squeeze you'll get.

Injury risk · 2/10

Variations

Same movement, moved emphasis.

Ranked by how directly each variation still trains chest. 80%+ means the target barely changes. Below 60%, the emphasis has meaningfully shifted — useful for variety, but less precise for the specific part. The label calls it at a glance.

  • Pec deck, single arm

    One side at a time.

    100% on target

    On target

    Same target, minor adjustment.

  • Cable fly (free standing)

    Cables high, hands meet at chest height.

    95% on target

    On target

    Same target, minor adjustment.

Compare with another exercise

Cool-down

Worked it. Walk it back down.

A couple of minutes here pays back in soreness avoided tomorrow. Browse the full library.

  • Doorway Pec Stretch

    Forearm against doorway, elbow at shoulder height. Step the same-side foot through. 45s per side.

    ChestFront delts

  • Cobra Pose

    Lying face-down, hands under the shoulders. Press the chest up by extending the back. Hips stay on the floor. 30s. Antidote to a long day of crunches and sitting.

    AbsFront deltsChest

  • Downward Dog

    Hands and feet on the floor, hips in the air making an inverted V. Press the heels toward the floor. Pedal the heels alternately for a stronger calf stretch. 45s.

    CalvesHamstringsLatsFront delts