The source said the boot camp includes, "various tests, confession sessions, tons of reading and physically challenging purification processes. Tom insists that auditing and purification practices are incredibly beneficial to Scientologists at all levels." Some of the sessions have lasted for 36 hours straight -- with little sleep or food.

Katie's intensive Scientology training and treatments have been accelerated in recent weeks, says another source, because she wanted to go to New York City without Tom Cruise to star in a Broadway play. But Tom stepped in and put the kibosh on her plans.

(Source: Dlisted)