There is no number for everyone- each person has a different number.
Crunches will help you to get abs however, you will not be able to see them without losing weight. If you have a layer of fat over your abs, no amount of crunches will give you the abs that you are looking for.
The question of the best ab excerise is highly debated. You will find sites that claim ONLY crunches will do and sites that claim ONLY full situps will do. In my experience they're about the same but crunches are less stressful for the back...remember reverse crunches are just as effective and you may find them easier.
i will say 500
you cant. but you can get abs by doing bicycle crunches and regular crunches.
YES!!! i have been doing sit ups for about 4 weeks now... About 250 a day and my stomach is clearly getting flatter and i can see my abs more clearly.
No, a bike is not the best for abs. You should look into a AB machine at the gym or simple crunches and sit-ups.
Yes, cable crunches are an effective exercise for targeting and strengthening the lower abs.
Itz very possible
Crunches are the best way to help rid belly fat. Not only should you do traditional crunches, but you should also target your lower abs and oblique's, which can be achieved through side crunches and bicycles. http://hubpages.com/hub/Stomach_Exercises_to_Eliminate_Belly_Fat
Mainly just the abdominal muscles.
Situps and crunches are good abs exercises.
Doin crunches