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As Stevie stated, lock you legs around something when you go back to the seated position. Some seats also have a "seat belt" to help you keep position. Also, I prefer the seats with the long back board. That way I can always feel whether or not I'm touching it.
When you do these exercises seated, do it in front of a mirror if possible, or have someone spot your form. That way you can get the correct feel for the exercise.
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