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In this movement, you hold a dumbbell in each hand and have a palms-up (supinated) grip on the way up and a palms-down (pronated) grip as you lower the weight, so all of your elbow flexors get hit!
Some of your elbow flexors act as supinators as well, so rotating the wrist and forearm during the curl instead of at the bottom will load up that function.

@steemmatt I feel like this would be a great bicep/forearm exercise for your baseball swing. Its a great lift!! Rich Piana (RIP) would do these. Here s his video

I am so going to start doing these!!! :)

@mudasirfarooq - might want to cite your source before cheetah bot finds it!

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