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Back Breaker Exercises do the following:
1. Flex the Spine—for example: touching your toes, doing a sit up/crunch, deep squatting or deadlifting while not maintaining lumbar lordosis throughout the entirety of the movement.
2. Rotate the Spine—for example: Russian twists, “oblique” crunches, rotational stretching
3. Put the Spine Under Load—for example: seated crunches, weighted crunches or sit-ups and weighted Russian twists.
4. Any Combination of the above—for example: burpees, Russian twists, Sit ups with twists