2. Crunches on the Floor
Crunches that are done while you are lying on the floor are not really effective enough to help you transform your body. They are not dynamic and involve just a small group of muscles. Crunches can even do damage to your spinal cord. According to some experts, crunches can cause disc rupture, also known as hernia. This happens due to the stress that you put on your spine during the exercise. Additionally, crunches become less and less effective with time. In the future, in order to get the same result, you'll need to do more of them. This, again, will inevitably do more harm to your spinal cord.