FItness challenge: 30 Day Jackknife Sit Up Challenge

It is officially April and a great month to focus on working those abs!  Spring has arrived, even though it doesn't feel like it, and it is time to get ready for summer clothes. That is if you haven't already been working your butt off during the winter.  The jackknife sit up is a wonderful and simple exercise…

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FItness challenge: 30 Day Jackknife Sit Up Challenge

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