In that case, maybe:
hé qì dào
I'd be careful with that. hé qì (aiki) is actually a Taoist term dating back to around the 2nd century, but it refers to sexual rituals in the early Taoist communities. The term refers to "mingling and joining the energies." But you're probably safe; I'm pretty sure very few people even in China today would even know about that use of the word. I'd hope so, at least, for the sake of the Chinese aikido community.