Arm Muscle Anatomy

Arm Training Mechanics

Education | Dec 10, 2025

Why Balance in Training Matters

If you want real strength and that classic defined look, you can't just spam standard curls. Your arm is a complex system of multiple "heads" and muscle groups. To get results, you need to work them all.

The Biceps: Long Head vs. Short Head

  • Standard Curls: Targets both heads for general mass.
  • Hammer Curls: Targets the brachialis (under the bicep) and the long head, adding width to the arm.
  • Incline Curls: Stretches the long head, helping with that bicep "peak."

The Triceps: 2/3 of Your Arm Mass

  • Standard Pushups: Works the whole group, emphasizing the medial head.
  • Diamond Pushups: Targets the lateral head (the "horseshoe" look).
  • Overhead Extensions: The only way to effectively target the massive Long Head.

Grip Mechanics: Pull-ups vs. Chin-ups

  • Pull-ups (Hands Wide/Overhand): Maximizes back engagement and hits the outer forearm.
  • Chin-ups (Hands Close/Underhand): Heavily recruits the biceps, making it one of the best mass builders.
  • Neutral Grip Pull-ups: The safest way to target the brachialis and brachioradialis.
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