LONDON (Reuters) - Seven British insurance company workers on a motivation course got a roasting after attempting a fire-walking trick perfected by Indian fakirs. The workers were rushed to hospital with burns when the coals they were persuaded to walk over turned out to be red hot instead of merely glowing, The Sun tabloid reported. Two were transferred to a specialist unit and may need skin grafts. The exercise was part of an intensive training course on team work and motivation. "It was supposed to show them they could overcome anything," one insider told The Sun. The company said it was investigating the accident, which occurred during a course run by an outside agency.