The best ab workout exercise is the plank hold. It is an isometric exercise which means that you have to contract your muscles for a certain period of time without moving them. They are especially effective because they can build strength and endurance much better than by using free weights.
Plank holds are also least likely to cause injury because they do not require any movement. If you have back pain or related problems you can still perform this exercise without risk. You can actually strengthen your back by doing plank holds because it works out a number of muscle groups in one go.
Lie on the floor facing downwards and lift yourself up by resting only on your toes and forearms. Keep your back straight and don't bend your knees or your neck. Hold this position for as long as you can and you'll feel your ab muscles getting worked out if you do it properly.
It's important to keep your back straight and ensure that you are not dipping at your waist or raising your butt high. This affects the effectiveness of the workout so make sure that your body is straight while you perform the hold. It's also important to breathe in a normal, even way so that your ab muscles can flex easily.
After you tire from this hold turn sideways and do the hold by resting only on one arm and one leg and raise your free arm upwards. Hold this position for as long as you can and you will feel your obliques being worked out. Do the same thing facing the opposite side and resting on your other forearm and foot.
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