Swiss balls made for a good ab workout this morning.
Here are some links to help explain the exercises.
Med Ball Crunches http://www.ehow.com/video_2367915_medicine-ball-crunches.html
Swiss Ball Hover http://www.ehow.com/video_2350885_stability-ball-ab-exercises-prone.html
Swiss Ball Hip Thrust http://www.youtube.com/watch?v=1aSbQOU7A2o
Bosu Ball Push Ups http://www.youtube.com/watch?v=BZmNqSVo2gw
Lunges Holding Swiss Ball http://www.youtube.com/watch?v=uYFOQ72mHbs
Mountain Climbers http://www.youtube.com/watch?v=DyeZM-_VnRc
Burpees http://en.wikipedia.org/wiki/Burpee_%28exercise%29
Reverse Crunch with Swiss Ball http://www.youtube.com/watch?v=FcXf7eWH2sI