Russian Twists : Loaded Russian twists, performed for 10 reps per side. Hold a weight with both arms for resistance.
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Kettlebell Windmills : The kettlebell windmill is a great compound exercise with some much-needed rotation.
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Hanging Leg Raises : Hanging from a chin-up bar, raise your legs until your legs and torso from a 90-degree angle.
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Gorilla Chin/Crunch : The gorilla chin/crunch is kind of similar to the hanging leg raise but still a bit different--that's why it's another stand-alone exercise.
Image source : Google
Image source : Google
Cable Crunches : The cable crunch is another classic ab move. Kneel below a high pulley that contains a rope attachment.
Side Jackknifes : Side jackknifes will leave your midsection sliced and diced, in a good way.
Image source : Google