I remember that a few years ago, I watched a YouTube video about Qigong. In that video, there is a man who cannot be lifted easily by other people when he does not use Qigong force, but when he does use his Qigong force, somehow others cannot lift him easily anymore. I tried to search for that video again, but couldn't find it.
Also, do you believe in what that man did in the video? If that is true, then Einstein theories needs to be modified, as people found a new force besides gravity and nuclear force.