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An oldie but a goodie, jackknife sit-ups can add an extra dimension to your abdominal workout. They can be performed with or without weights, in a face-up or prone position, and with or without resistance bands.  A classic exercise that has endured the test of time, jackknife sit-ups or V-ups may be just what you are looking for to carve out and finely sculpt that six-pack you’ve been working so hard to achieve. So what exactly is a jackknife sit-up? Consider the jackknife; a compact device that unfolds into a multi-faceted