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Machine Chest Flye Deep Stretch - Unilateral Single-Arm Execution

Machine Chest Flye Deep Stretch - Unilateral Single-Arm Execution is a specialized strength movement targeting the pectoralis major (sternocostal portion), anterior deltoid, and serratus anterior. The guided mechanical arc of the pec deck machine eliminates stabilization demands, enabling an isolated deep pectoral stretch and peak contraction with joint safety. Unilateral single-limb execution forces intense anti-rotational core stabilization while directly targeting and correcting left-to-right strength discrepancies.
Shoulders & Deltoids Sitting Volleyball
Specification & Key Parameters
4 parameter
Parameter Value Parameter Value
Duration
15 min
Calories
350 KCAL
Level
intermediate
Equipment
Machine, Pec Deck / Butterfly Fly Machine

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i Instructions

  1. 1. Setup & Scapular Bracing: Sit upright on the pec deck/butterfly machine with your back firmly against the pad. Adjust the seat so the handles align across your mid-chest. Grip the handles, keep elbows slightly soft, and retract your shoulder blades.
  2. 2. Unilateral Anti-Rotation: Open one arm wide in an isolated arc while bracing your trunk to completely resist torso rotation.
  3. 3. Arm Switch: Complete all reps for the working arm, then immediately switch to the other arm matching cadence and volume.
  4. 4. Breathing & Joint Safety: Inhale as the machine levers open smoothly into deep pectoral abduction; exhale forcefully as you drive the levers together into full horizontal adduction. Maintain total intra-abdominal pressure and active scapular depression throughout the set.

Physiological Impact

5%
Heart Rate Impact
6%
Muscle Load
5%
Fatigue Level
4%
Recovery Rate

Caloric Benchmarking

Running 400 kcal
Cycling 300 kcal
Swimming 500 kcal
Actual exercise 350 kcal
0 kcal 300 kcal 600 kcal
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