The stability ball ab rollout is a great exercise if you don't have an ab wheel available. But it's also a good choice if the standard ab rollout is too difficult for you right now.
It's essentially a partial rollout since your body isn't going down as far. You can start with a large ball, move to a smaller one as your core gets stronger, and finally do the ab wheel with the full range of motion.
Like everyone else, I've had my role models and mentors who've looked out for me. My mother has taught high school English for over 20 years, so I owe a lot of my writing success to her. My father taught me to tie a tie and to remember to check the oil in my car. My brother, the accountant, is always a phone call away if I need financial advice.