Let me ask you something.. Do you hate sit ups? I hate sit ups. And there is a very solid reason for it..
Before that, how many times have you seen the commercial where ripped models are using the product X and 'working out on it'? Many, I bet. Maybe you've bought one of those things too, and now it's just collecting dust. Never fall for those commercials, NONE of the things there work. Some of the commercials claim the product will get you abs only with 7 minutes of exercise per day!
... Now that is just outrageous. You can't get abs with a cheap plastic toy which bends and does nothing else, you get abs with 101% dedication, 90% work 120% rest and 200% nutrition. That's how you get abs, and that is how you get ripped, don't spend your money thinking 'maybe this one will work'. It will not, it never will. You can go to the gym, destroy yourself in there for two hours a day, three days a week and you're not going to achieve ANYTHING if you come home and eat pizza.
If you are buying these products, and believe me, A LOT of people are falling for these, you probably don't know how to work out your abs. The only exercise you might think of to get abs is sit ups, right? Well..
Sit ups.. They don't work. Sit ups are useless, and they can mess up your back. Do NOT do them. Ever. They're a complete waste of time. Your abs are not going to get the workout they need, it might seem like it's helping in the beginning, but you could've actually gone way further if you were doing something else, and you're probably going to start having problems with your back soon.
There is something, far greater than sit ups..
And that something is crunches. Crunches are just plain wonderful. You lay down flat on your back, legs bent, hands behind your head lightly supporting your neck, looking up to the ceiling, you move your face towards the ceiling together with your shoulders. Do not begin doing a sit up, this is not a sit up, this is a crunch, concentrate on contracting your abs and as far as possible, as soon as you're at the most you can move your shoulders forward, HOLD. Hold that position for atleast two seconds, then slowly lower your shoulders down. Repeat. So what if you can do 20 sit ups, try 20 of properly done these, you'll see the HUGE difference. So, you work your way up to 20 of properly done these, now, take a big book, or a brick, or just something heavy you can fit, and hold it under your head while doing the crunches. This'll be like exercising with crunches all over again.
Form is KEY in this exercise. Do not concentrate on how many you do, concentrate on your abs, and the perfect form. If you don't, you'll end up working out your neck, or your hips. If you want to do that though, feel free, but it's not going to make your abs stronger. Remember to move your shoulders straight up, no arms flailing around, no moving your head around. Try to lessen the tension in your neck, you have to learn to support it right, try different ways, just do not hurt yourself.
Why you would want to do this? This will strenghten your abs, and strong abs stabilize your lower back and protect you. They also look great!
Do not forget, nutrition is key to achieving abs. You can have rock hard abs, but nobody will be able to see them! Make sure to not make common mistakes, and sleep right!
Cheating a day is better than quitting.