I've been doing some leg lift variations at the gym here and there, but decided that if I am going to spend a bit of time working my abs that I should have an exercise that either allows me to make progressive gains somehow or be able to add weight to. With leg lifts it would seem rather impractical to hold dumbbells between my ankles or something (and I'm not going to do 1000000 reps because that's a waste of time, even though so many people do that!). Or maybe holding a dumbbell there would be fine? I wouldn't know, I've never tried it with leg lifts before.
I guess a typical answer would be weighted decline crunches, but I'm wondering if there's anything else people do.
Anyway, any input is appreciated.