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Safety
Safety

Pectoral Training — Internal/External Rotation & Bar-Placement Cautions

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Historical reference: its only source is the original reference manual, and some of it may be out of date. Not used for AI answers until re-sourced.

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pectoralschestinternal-rotationexternal-rotationrombar-placementdipsbarbell

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DefinitionA short reference note, not a full lesson.
Definition

"Be safe" in chest training — determine the user's ROM beforehand, beware internal/external rotations from improper bar placement, and note that dips cause extreme shoulder hyperextension (ROM 45°).

Detail

The primary movement in pectoral training is horizontal adduction (flexion); secondary movements are shoulder-joint flexion and adduction. Several safety cautions are stressed (each flagged "Be safe!"):

  • ROM is not determined by how far the weight moves. It is important to determine the user's ROM before the exercise movements. BE SAFE.
  • Dips cause extreme shoulder hyperextension. Be safe. ROM is 45 degrees.
  • The question of training inner vs. outer pectorals via different grip widths is raised with "Be Safe!"
  • Beware of internal and external rotations as a result of improper bar placements. Be safe.
  • Use of barbells limits range of motion.

Dumbbell flyes are likewise flagged for caution (the facility checklist labels them "Dumbbell Flies (Caution ROM)").

Key facts

  • Determine the user's ROM before the movement; ROM is not how far the weight travels.
  • Beware internal/external rotation caused by improper bar placement.
  • Dips → extreme shoulder hyperextension; ROM 45°.
  • Barbells limit range of motion.
  • Dumbbell flyes carry a ROM caution.

Connections

Go deeperDumbbell Flyes

Sources

Historical reference · reference manual (page cited)
p.132
Pages: 132.

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Explore related topics

Atlas Connections

External Rotation
Rotation with the axis of the bone turning away from the body (e.g., the humerus turned outward).
Internal Rotation
Rotation with the axis of the bone turning toward the body (e.g., the humerus turned inward).
Pectoralis MajorClosely related
The chest muscle (clavicular and sternal portions); its primary action is horizontal adduction (flexion) of the arm — a powerful action.
Dumbbell Flyes
The fly trains the chest by bringing the arms together in a wide arc with the elbows held slightly bent and still. It uses far less weight than a press because of the long lever, and it builds chest size on its own. Use it beside a press, and lower only to a stretch you can control.
Dips — Extreme Shoulder Hyperextension (ROM 45°)Closely related
Dips cause extreme shoulder hyperextension — be safe; the shoulder hyperextension ROM is only 45 degrees.
Dumbbell Press — Ending With a Wrist-Rotation Twist Reduces Pec ContractionClosely related
Twisting the dumbbells to a supinated, pinkies-together position at lockout produces LESS pectoral contraction (EMG), not more — because the twist diverts force into humeral rotation, off the pec's actual line of pull.
ROM Is Not How Far the Weight MovesClosely related
Range of motion is not measured by how far the weight moves — determine the user's true joint ROM before the exercise, for safety.