3 - The diaphragm :
Like any muscle, the diaphragm can become tired by repeating large breathing
movements. Some claim that diaphragm fatigue can cause spasms, causing
the dreaded side stitch. (Others argue that the side stitch is due to
spasms of the ligaments around the diaphragm,
while others believe that
spasms come from nerves that extend from the upper back to the abdomen
and are caused by poor posture! Deep breathing and stretching can
relieve this discomfort in the middle of a workout.
4 The heart
4 The heart
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