I read Frederic Delavier’s book « Strength Training Anatomy » and there is good stuff about barbell curls.
Podcast
Standing with your back straight, take the barbell with a supinated grip and your hands are wider than your shoulders :
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Inhale and flex your arms with an isometric contraction of your glutes, abs and spinal to not swinging your torso.
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Exhale at the end of the movement
This exercise works mostly biceps, brachialis and a little bit the brachioradialis, the pronator teres and all the flexors of wrist and fingers.
Variants
When you change the spacing hands, you work deeply different part :
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Widely spaced hands = short head of the biceps
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Very close hands = long head of the biceps
When you raise elbows at the end of flexion, you increase biceps contraction and you work the anterior deltoids.
You can do this exercise in a strict way with your back to the wall without lifting your shoulder blades.
-Steph