What machines can work on your abs effectively?

hey man theres a crunch machine most gyms should have them it looks like a carnival ride like your about to lay down and you put the weights on the back and you pull foreward if not you can use one of those giant rubber balls sit on it with ya bum right at the edge like a chair lean back make sure ur feet are supported i like sticking a weight across my chest and doing it like that there is also a pull up bar do hanging leg raises from that that will work lower abdominals or there should be a sit up bench where u can raise the level of height on it but dont forget with out a body fat below 10% u will see no abs my friend good luck .
 
 warren

Lol forget all the machine crap you get for working abs. There is no need for them.. 3-4 sets of weighted crunches to work your upper abs, and some sets of hanging leg raises (weighted) to work your lower abs, will do the trick.