In Taiji practice it is vital to integrate the entire body. One problem is that any direct effort to integrate the entire body will almost always be via contraction, either gross or subtle and this is of course an error. The cause for correct integration of the body and jin lu through release is dependent on openness. This does not mean trying to have an open or big posture as that too will just be done via contraction. This opening must be trained directly. Opening is progressive from joints, to muscles to membranes to channels and so on. The result among other things is a profound level of integration via release.