If you've ever watched a youtube video of this guy speaking, it's enough to know how nasty his energy is.
Forum: "Cults," Sects, and "New Religious Movements"

That's weird, I did it and never did any mass marathon training....I guess it depends on the group leaders. I would say its a wasteful money making exercise though.
Forum: Large Group Awareness Training, "Human Potential"

I've done the Mankind project, I wouldn't say it's a cult, just a huge waste of money really. Seems to pray on men's insecurity without providing them with what they are really looking for. At least that was my experience. As for David Deida I think the only real way to know about him is to ask someone who has been to his seminars or listen to the secret recordings of his
Forum: Large Group Awareness Training, "Human Potential"