Ennay- thanks for describing the plank. I've been searching fo a picture.
Once you can hold the basic plank for one-two minutes on your elbows, get creative! try holding on one leg for a few seconds, then switching legs. try lifting one arm without rotating your torso. Also try side planks.
Planks are a great exercise because they work both abs and lower back.
Another great
exercise for your abs, obliques and lower back using a stability ball without crunching is a
Russian Twist.
Mel
Mel