From
- leg -> hip is an upward motion.
- hip -> arm is a forward motion.
Is there another way of doing this? I don't think so. Can you apply this power generation method in all MA systems? I believe you can.
If you train for "health", you don't need to learn power generation. If you can knock your opponent down with your punch, your power generation is good no matter which style your power generation may come from.
I have seen people who brings:
- Baji Fajin into praying mantis system.
- While crane Fajin into Yang Taiji system.
Both look very good to me.