Challenge your abs, obliques and lower back with these core strengthening exercises. A thorough core workout routine designed to transform your midsection. http://www.spotebi.com/workout-routines/core-strengthening-exercises-abs-obliques-lower-back/
Hop on a stability ball, stick your feet against the wall, and extend upwards. Hold for seconds at the top — they're absolutely killer and they're a great core workout. I feel like this might help my back pain. gonna try it.