What happens next?

How to do inclined sit ups
Find an incline bench.
This exercise will work best if you have a support bar, or foot brace, under which to hook your feet as well.
Set the decline angle.

Possible answers:
1). If you are lifting the weight of your body, however, you can aim for a decline of a single degree. It is important that you stand at a 45 degree angle, keeping your arms square.;
2). Keep your feet shoulder-width apart and your forearms parallel to the ground. Your feet should be a comfortable width, with a slightly wider up or down angle depending on what you're doing.;
3). There are two 120 degree angles available to you. One degree angle will yield the most accurate results, but one will give you an inaccurate reading.;
4). You should start with an angle between 30 and 45 degrees. The higher the angle, the harder the sit ups will be.;
4).