If you know how to do sit ups, you can start strengthening your abdominal muscles right away. You don't have to go to the gym, because the privacy of your home offers everything you need. The correct performance of these exercises is crucial, for your own safety, as there is a chance to hurt the neck and head muscles as well as the spine. Another common problem is to use other parts of the body during the sit-ups, besides the abs. You should just focus, and you'll see that practice is easier than in seems.
Sometimes it is not just a matter of how to do sit ups, but how to train to lose weight. Many people mistake abdominal exercises for weight loss solutions. They couldn't be more wrong. Weight loss occurs evenly, and you can't target a particular body part to make it slimmer than the rest. The process is natural, and you should not work against it. If you learn how to do sit ups, it should be because you want to grow a six pack or simply wish to have a firmer abdomen. Don't envisage weight loss here, because it won't happen.
Here is how to do sit ups:
-lie on your back;
-bend the knees but keep the soles of the feet flat on the ground;
-cross the hands over the chest or place them behind the head for a central rising point;
-tighten the abs by drawing the belly button towards the spine;
-by the abs contraction lift the head and the shoulder blades slowly;
-pull up from the floor about half way, hold the position then slowly bring the torso back to the floor.
The position of the hand is important whenever you do sit ups. When people learn how to do sit ups they will need the most comfortable position possible and the lowest difficulty level. The hands behind the head protect the neck from injury; however you can keep them up in the air or by the sides, and thus make the sit-ups more difficult. Only make such changes when you've grown stronger and you can better rely on the abs for more complex support.
There are numerous training guides available online. You can thus learn how to do sit ups by watching videos on YouTube and specialized fitness websites, or by simply following the instructions you read in various articles. The plethora of information should makes things easier for you to put into practice. It is preferable to read from several sources to make sure that you get everything straight, and only start working out on your own.