Bicycle maneuver? Captain’s Chair? Vertical leg crunches? Ab Roller? Traditional crunches? or a combination of all these.
There isn’t just one. Variety is the key. Here’s a really good site that might help you with your question: http://www.healthlessonsonline.com/
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There isn’t just one. Variety is the key. Here’s a really good site that might help you with your question: http://www.healthlessonsonline.com/