I am on a strength training program that works with sets of 2 reps and I still cannot find an ab exercise that is hard enough to get me tired in 2 reps...even with adding weight on my chest and what not.

And I know it would help to have a decline bench, but I don't have one so I guess that makes it harder to find a really hard ab exercise. The past 2 workouts my ab exercises have been crap because after 2 reps I can't feel that much work going on.

So, is it literally just impossible to find an ab exercise hard enough for 2 rep sets? If not, someone please share some love with me.