Enduro Force Focus on improving bicep curls. When some people do a bicep curl, they do not get all the benefits they can. They are unable to move the dumbbells past parallel, not getting the most out of the last half of the curl. The top portion of bicep curls is the strongest. You can correct this through the use of seated barbell curls.Enduro Force If you're an adult who wants to gain muscle, try a creatine supplement.

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