If we refer to the curl of biceps, there are different variations in the execution, because on the one hand we have the free curl that we do on foot.
The concentrate instead we will do it sitting with the arms supported in a bank, causing that the maximum tension concentrates in the worked zone. We can also do it on a pulley Trialix, standing on a wall ... Whatever we do, it is necessary to keep in mind that we must always do it correctly and avoid mistakes.
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