I did this stability ball workout for my core last night and I'm SO sore today. After Thanksgiving indulging this was exactly what I needed to get me back on track!
You'll want to do each exercise 10 times and repeat the whole thing 3 times to complete the workout. The mountain climbers were the HARDEST thing ever and I felt those immediately. Make sure you do 10 of those with each leg so 20 total.
Let us know if you tried this one and what you thought! Do you have any other killer core workouts we should try?