A strong core will not only have your abs looking strong and firm but it will help you in other lifts and also will help prevent injuries. The core workout i am going to show you can be tagged onto the end of your cardio workout or abs training or used as a standalone workout. This can be done 1-3 times per week for maximum effect.
Your core is basically a term used to describe your body, specifically around your abdomen and sides. Good core strength is vital to help protect you from injury, eliminate body fat in this area and increase your overall strength.
Your core muscles will be engaged as supporting muscles through most exercises especially resistance training ones.

This at home ab workout is to be performed as a circuit, so you go from one exercise straight to another until all exercises have been performed. Rest for a minute and then repeat 2-3 times.
Perform these exercises as fast as you can whilst maintaining good technique and form. The moivements should be controlled and at no pinot should you look like you are being shot with a tazer.
Medicine Ball Wood Choppers 20 reps each side
Medicine Ball Saxon Bends 20 reps total
Medicine Ball Sit Ups 20 reps (Hold for 1s)
Medicine Ball Side Twists 20 reps
Plank 20 seconds
Rest for 1 minute then repeat 2-3 times
A continuous circuit like this will place a demand on your cardiovascular system and help increase your fitness levels as well as toning and firming your mid section and is a great way to do an at home ab workout.
You should use a medicine call that is heavy enough for you to feel the extra resistance but not heavy enough that you struggle with each exercise. If you don't have access to a medicine ball then you could use a household object such as bottle of water, bag of flour or even a soccer ball to begin with and gradually build up the weight as you progress.
As the at home ab workout gets easier then add 10 reps to each exercise and complete the workout like this. Keep repeating this method to constantly challenge your core.
Top Tip
Like with any workout training your abs is no different. You should aim to increase the number of reps for each exercise you do by atleast 2 each week. This way you will know you are improving.
Another way to increase the intensity of the workout would be to add extra exercises, decrease the rest period or increase the number of sets you do.
The below video shows a variation of the above home abdominal workout and is called the 200 Rep Medicine Ball Workout. Its demonstrated by my buddy Vince Delmonte and is an example of a great core workout.
As you can see by the video you do not need alot of space or equipment and this home abdominal workout is easy to fully and will produce results fast.
Which ever variation of the workout you decide to follow make sure that you consistantly stick to it. I know i go on about consistancy alot but it really is the secret to achieving any goal you set.
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This home ab workout program lets you work towards 200 sit ups in one go and only takes on average 6 weeks to do. 
For those who have not tried it 200 sit ups is a challenge and with this workout will take just 6 weeks to build your core strength to a level of being able to do 200.
If you have a great home workout for your abdominal muscles then why not share it!
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