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After all, the definition of contraction is "the process of becoming smaller." However, this only tells part of the story.

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For example, here's how the biceps function during a Curl: The eccentric portion of the lift is actually about 30 percent stronger than the concentric portion.

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Muscles have three types of contractions, each of which produce forces, but the muscle doesn't necessarily shorten.

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So if your max Curl is 50 pounds, the most your muscles could handle on the eccentric action is 65 pounds.


Manual push action hand drills:

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