The diaphragm is the most active muscle group during a marathon, working constantly to facilitate breathing.
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Human Body
Though the legs propel a runner forward in a marathon, it's the diaphragm that works tirelessly to ensure a supply of oxygen by regulating the breath. Running increases the respiratory rate significantly, making the diaphragm continuously active. Strong, efficient breathing helps prevent fatigue and improves performance, highlighting the critical role the diaphragm plays in endurance sports.
