I know coaches who spend a lot of time pushing kids over on pull-over. Every child seems to want to do one. Even those who do not yet have the strength to pull themselves upside down.
source unknown
I refuse to lift any child up on to a bar (they must climb) and I try my best not to spot pullover. My philosophy is not to spot anything for recreation kids.
That means I set-up folding mats in order that the smallest kids can reach the bar on their own.
That means I must be very innovative in drills and equipment set-ups in order to find ways for the kids to get around on their own.
For as long as possible, emphasize other, easier skills and drills on bars. If you have low rings, pull up to inverted hang is an ideal progression.
When you must start the pullover, have beginners do a slow half forward hip circle (the opposite of pullover).
Next have them walk-up a “ramp” of some description (perhaps an elevated beat board), trying to touch hips to the bar. Several times in series.
Lastly I will (reluctantly) spot. A few repetitions.
Eventually the kids can spot each other while I oversee the entire class.
Gymnastics Coaching.com 