Jan Prokeš

Jan Prokeš

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Jan Prokeš
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Why Sit-ups, Curl-ups and Crunches Do More Harm than Good

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intercostal muscles

Muscles of respiration (diaphragm and intercostal muscles) along with accessory muscles of respiration described. The change in diameter of thoracic cage also highlighted briefly.


“The fibers of the diaphragm are oriented vertically, do the fibers contract on the inhale or the exhale?