When doing weighted Decline (60 Degree) Ab sit ups. . .

[PoonRaider]

Should I keep the small of my back flexed, and should I allow my back to touch the bench before I come back up, or stop a little bit short?

 

[bran987]

just make sure you keep the tension on the muscle throughout the set, do not 'relax' at the end of a rep and then start again.