Toning the tummy?

what are some good ways to tone my tummy? i'm not looking to lose any bulk, but i wanna tone my stoumach. any good excersizes?
<3nataliaToning the tummy?
At least possible 50 curl-ups, twice a day, for give or take a few 3 months. It'll look nice, just don't expect a six-pack or anything.
I found holding a dumbell over my pave the way while doing reverse sit-ups was really compassionate for my lower abs.