Did you mean sit-ups?
Also, you could try planks.
Same problem. I ended up doing one-arm pec flies.
Cardio and burnouts. Reduce your meat in-take to breast chicken/turkey or/and fish and increase your fiber from beans/wheat and get more fruits and veggies in your system. Excellent ways to get nice cuts and low body fat.
I'm already vegetarian/almost vegan and I have increased my intake of soy proteins in consequence. It is not true that the best to lose weight is to do a to of cardio. The best is a mix of cardio and muscle training. While cardio burns more calories directly, gaining more muscle greatly increases your basal energy expenditure. Once you have reached your desired muscle mass, you can reduce the frequency of your work-outs and as long as you keep the same intensity, you're body mass will be maintained and that's basically free burned calories.