In fact crunches are one of the abs exercises that actually provide the least amount of resistance and it is resistance what develops and tones the muscles.The highest resistance exercises for the abs are hanging leg raises. This exercise works the entire front abs and especially the lower abs. This exercise takes time to get it right and has to be done correctly to avoid injury and obtain the desired results. It is performed by holding yourself up from a chin up bar with your arms just over shoulder width apart.

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