There is a fundamental flaw with commercial instruction.
The biggest flaw is you need the money.
Rewind the clock. Go back to history. Time for some Kung Fu lessons.
Kung Fu is originally taught father to son down the lineage.
Then it's taught teacher to student or more correctly
disciples.
Then it's taught commercially.
Teacher to disciple is actually stricter than father to son.
Here's how you get into Kung Fu school.
When things are taught commercially, it's all watered down.
"The biggest flaw is you need the money." You are at their beck and call. They call the shots.
That tradition continues to today. I know it's fiction. But, fiction is oral history. Oral history contains a
genetic memory.
I wouldn't teach for money. I don't need the money from teaching anything. I'd tell her to "F*** off."
At age 7, they are not tall enough to play ping-pong (table tennis) (maybe they are tall enough with the growth hormones in the food), let alone bigger tennis.
Here's how I would do it. You want to learn tennis? I'll put up a ping pong table. When you can beat 90% of the kids your age, I'll teach you tennis. Oh, I won't teach you ping pong. That's the "wax on, wax off" trick. When you learned "wax on, wax off", you already learned Karate (Kàrátề to be more precise). When you can beat 90% of ping pong players your age, you already know tennis. Until then, they can f*** off.