When you get to the top of the Sit-Up, you should exhale (breathe out). While you are lowering yourself, you should inhale (breathe in).
I don't understand what you mean by "fit fastened." What does this mean?
You should use a controlled motion throughout the movement. This means you shouldn't do them very fast at a rigorous pace. Instead, you should concentrate on flexing your abdominals to bring your torso to the top of the movement. While at the top, flex your abdominals as hard as you can for one second. Upon lowering yourself, lower yourself slowly in a controlled manner. Don't just let yourself drop to the floor.
On each repetition, concentrate on flexing the abdominal muscles and nothing else.
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Practice makes permanent.
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