Hi Deborah,
The idea behind the split step is to get you ready for the next shot as quickly as possible, keep you on your toes but remaining balanaced and in control of your body.
In its most basic form, the split step is simply a small jump with both feet that helps you rest your feet, regain balance and be ready for the text shot and explode in the direction of the ball.
Hope this helps.
Archie
