We are all obsessed with flat bellies but running is just one way to work those abs and your core. You can reduce your waistline in just a few weeks by regularly doing simple half crunches at home. This one is ideal for beginners as you only have to activate¬†your abs to lift your torso slightly. In a half crunch, you are only 2-3 inches off the floor and it’s a good gateway to some of the more advanced crunches that target the abdominal muscles and obliques.

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