Poor form ...

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Quick training question..as a 'newbie' I'm making reasonable gains and spending time working on my form... (initially I wasn't too bothered about 'which' muscle grew; just so long as a muscle was growing) meaning technique often took a back step ...however I've noticed on my bicep curl i'm pulling my elbow forward; (too heavy weight I now know) which is bringing my shoulder/delts into play; which got me thinking; is this a good strategy for training shoulders/delts, while still working the bicep ...??

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