Do Dunbell Flies Really Work?

Research on stretch mediated hypertrophy has quite clearly shown that it's responsible for the majority of the benefits of training for a full range function. Two primary explanations for that are likely passive tension and Titan myofilaments, which is essentially spring loaded during eccentric muscle contraction to long lengths. Double flies score very well in terms of stretch mediatedhypertrophy. They neglect the top part almost completely but if we look at the Nuneus example, they would be the equivalent of the Dumble feature curl.

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