What exercises can I do to get a really good core?
I find that a variety of simple crunches and situps works good for me, you just have to experiment
Darn thats too bad :( but crunches done right should be the easiest on your body. Otherwise maybe try hanging leg raises, mountain climbers, and swimming is a pretty good way to strengthen your core. A mix of cardio, good diet, and some type of difficult core workout is the best way to get flat abs, hope this helps! Good luck