What is a good little and simple exercise that exercises the core?
like sit ups, but something different.
Push ups are good and easy exercises that exercise the core. A good core exercise will work out the torso and cross several joints. You can go to http://sportsmedicine.about.com/od/abdominalcorestrength1/a/NewCore.htm and http://www.sparkpeople.com/resource/exercise_demos.asp?exercise_type=core for more information on core exercises.
Crunches, lunges, cable crunches.
kickboxing, 15min each morning and evening has really toned my hips, butt and abdomen
crunches take it from some one who know somthing unlike them like jasonrng
Planks, v sits and toe touches.