Crunch and Twist with the medicine ball or gym ball for a powerful core. Does it look very easy? A few reps of these will change your mind. And Pranav Bhargav just loves doing these, and calls them the secret to his ripped abs and defined obliques. For more ab workouts from Pranav and our other Fitness Icons get the latest mobiefit BODY app. Download and wait for the major update to hit this month.

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