Here's a good one for all you fit fanatics out there. This exercise not only blasts your abs (figuratively speaking, as we don't recommend discharging firearms during exercise) but it can be performed at a variety of skill levels, including Beginner, Intermediate, and Advanced. http://www.uweightloss.com/cross-over-crunch/
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Here's a good one for all you fit fanatics out there. This exercise not only blasts your abs (figuratively speaking, as we don't recommend discharging firearms during exercise) but it can be performed at a variety of skill levels, including Beginner, Intermediate, and Advanced. 
