I read a Frederic Delavier’s book « Strength Training Anatomy » and there is good stuff.
Podcast
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Sitting with a dumbbell in each hand in a semi-pronated grip.
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Breathe in and flex your forearm by rotating the wrist to the outside before that the dumbbell is horizontal.
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Complete flexion by raising elbows and breathe out at the end of movement.
With this movement you work the brachioradialis, brachialis, biceps, anterior deltoids and a little bit the coracobrachialis and upper chest.
Biomechanics : this movement allows to use the fully function of biceps with flexion and protraction of the arm but especially the most powerful supinator muscle.
3 ways to do dumbbell curls :
A : Work mostly biceps
B : Work mostly brachioradialis
C : Work mostly biceps and brachialis
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-Steph
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