As your back becomes stronger, you can increase the difficulty and move the arms overhead. Abdominals To work the abdominals we must break them down into the simplest movement possible. Imagine this motion. Shortening the distance between your lower rib cage and the top of your pubic bone. That is what happens when you perform an Abdominal Crunch.
Hands can be in several different positions depending on abdominal strength.
We'll start basic. Hands crossed over chest. Always a slow and controlled movement. Once again, never sacrifice form for repetitions. Your strength will come soon enough if you perform good form and you also reduce your risk of injury.