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About the power itself.

Yi Jin JIng power is look like external power who used a lot of tendon not mass muscle. so when the impact hits body it will be gone through the inside muscle.

And...

the inner power in here is like more that Qi. because based from what i know baduanjin is to develop qigong (wushu qigong).

although yi jin jing can develop inner power too, but the detail is...

yup, many opinions on it eugene. for me (maybe it could be wrong), Yi jin Jing is develop some tendon changing but not to train inner power. and Baduanjin is to develop inner power which more like...

i think both of them has similar posture but different in internal training..