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Should my back be cracking when doing ab exercises?

Posted by Jeff on Jan 21, 2009 in Bike Equipment
x Adhesive x asked:


When i do knee/leg raises on a specific piece of equipment, the one that has a back rest and forearm rests with grips, when i do my exercises, my lower back cracks, also when I am doing bicycle kicks, the same thing happens, i am guessing this is not good, what can i do to make this not happen?

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