Originally Posted by TimothyO
There are specially made green training balls too which are one level above the red and orange balls but below regular green balls. They're not simply "practice balls" either. Just slightly lower speed than regular balls. They're two-toned in some manner with lighter and darker green markings.
Thanks for that and yes, I'm referring to the 78 green low compression ball that hardly any teaching pros use. I didn't realize that there may be confusion. Those kids in the vid are playing with a low compression green ball designed for 12u or advanced 10u.