They are hailed as the most commonly used abs exercises in the gym today.
Spondylolysis
A stress fracture (type of back injury), nominally spondylolysis in medicine, is the most common injury of the lower back in sport and bodybuilding.
There are two variations of this back injury, namely the bone stress reaction or a stress fracture of the lower back.
This back injury is especially common in growing adolescents, as this condition is associated at the time of rapid 'growth spurt'.
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