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Dumbbell Fly animation

How to do the Dumbbell Fly

ChestDumbbellIntermediate

The dumbbell fly isolates the pectoral muscle through a wide arc of motion that pressing movements simply cannot replicate, making it a true chest-shaping tool. Master the technique and you will feel every fiber of your chest working under controlled tension.

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Muscles worked

Primary
Pectorals (chest)
Secondary
Front deltsTriceps

Step-by-step

  1. Lie flat on a bench, press two dumbbells directly above your chest with a slight bend locked into your elbows throughout the entire movement.
  2. Inhale as you lower the dumbbells in a wide arc, feeling a deep stretch across your chest until your upper arms reach roughly parallel to the floor.
  3. Squeeze your chest to drive the dumbbells back up along the same arc, as if you are hugging a large barrel, stopping just before the weights touch at the top.
  4. Control the tempo on the way down, taking at least two to three seconds to lower the load and never letting momentum dictate the movement.

Common mistakes

  • Straightening the arms completely, which shifts stress onto the elbow joint and risks injury, so lock in that slight bend before you even unrack the dumbbells and never release it.
  • Going too heavy and turning the fly into a press by bending the elbows further to compensate, so choose a weight that allows a full stretch with the arc intact.
  • Rushing through the stretch at the bottom and bouncing out of it, which eliminates time under tension and risks a pectoral tear, so pause briefly at the lowest point under full control.

Pro tip — At the top of each rep, instead of simply stopping the arc, actively try to pull your hands apart against an imaginary resistance before initiating the next descent, this maintains pectoral engagement through the shortened position where the muscle is most prone to switching off.

Sets & reps by goal

Build muscle3–4 sets × 6–10 reps
Get stronger4–5 sets × 3–6 reps
Lose fat / tone3 sets × 10–12 reps

Rest: 2–3 min between sets (60–90s on lighter days).

More Chest exercises

Barbell Bench PressBarbell Bench PressBarbell Decline Bench PressBarbell Decline Bench PressBarbell Decline Wide Grip PressBarbell Decline Wide Grip PressBarbell Front Raise And PulloverBarbell Front Raise And PulloverBarbell Incline Bench PressBarbell Incline Bench PressCable Bench PressCable Bench Press
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