مثال:
Although you might’ve grown up learning that an hourglass is a desirable body shape, don’t be fooled by the name of this condition. Hourglass syndrome isn’t the same as having an hourglass figure — and hourglass syndrome can be both painful and problematic.
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However, with the hourglass syndrome the diaphragm contracts in the opposite direction, towards the centre ( the spike in the middle of the umbrella ) which pulls the lower ribs in. This gives rise to the typical narrow waisted or hourglass appearance. Other clues of the hourglass syndrome include a ‘turned up’ belly button or a horizontal crease either at the level of, or just above the belly button. ‘Turning up’ of the belly button is a sign of muscle imbalance of the abdominals; with the upper section working much harder than the lower abdominals and pulling the belly button upwards.
The center of the diaphragm ought to descend downward, extending the abdomen and expanding the lungs. In the hourglass disorder, this normal pattern of motion is disturbed, and, mostly when inhaling, the chest and shoulders lift instead of compensating.
The main risk of hourglass syndrome is incorrect execution of crunches
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