ok so ive been trying to get a six pack (or atleast stronger abs) for a while now, and i was wondering if there are any different splits or workouts for them. right now all i do is one giant set:

Crunches x50
crunches with legs at ninety degrees x45
crunches x40
skyscrapers x35
straight leg raises x30
touchdowns x25
hanging leg raises x20
decline bench crunch x15

help would be greatly appreciated