I've noticed that I see no one use weights when they crunch at the gym I go to. I do, and I like to pretend I have strong Abs.
Find something that lets you lay down at about a -45 degree angle placing the weight behind your head how much are you able to crunch up with full ROM?
This is one of those lifts no one talks about, I want to see how I match up.
Post your weight, body weight and height. Shoot for a max 1 rep.