Celebrity Working Mothers 2

Angelina jolie is set to star as Lara Croft (the toned warrior) in the up and coming Tomb Raider 3 film. This sparked my interest because a) she is a working mother and b) she is currently pregnant and is said to be planning to start shedding the kilo's soon after the baby's birth. Now I know she has to shed the pounds for this role. But as far as I was aware you can only start exercising gently 6 weeks after birth so you do not injure yourself. Yet many celebrities 'have to' lose this weight for these roles. This begs the question how dangerous is vigorously training a post-pregnancy body??