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Primario
Secundario
Terciario
Dificultad
Novice
Fuerza
Pull
Agarres
None
Mecánica
Isolation

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Bring yourself on all 4's. Push the ground away from you, rounding back and shoulders as much as possible.
To enhance the spine flexion suck the belly button in and tuck the tailbone (coccyx) under. Hold this position for a brief moment
Now do the exact opposite, try to bend the spine backwards. Go back and forth on these positions