How does the forces of a roller coaster effect the human body?

What forces can the human body take?  Are roller coaster good for the human body?  How many g forces can the human body handle?  How many g forces can the human body withstand?  What forces does one experience on a roller coaster?  What affect does a roller cloaster have on a human body?  How the forces of a roller coster affect the human body?  How are the postive g forces created on a roller coaster?  What forces are acting on the roller coaster steel track?  What effect does a roller coaster have on the human body?  What are the effects of roller-coasters on the human body?  How does th forces of a roller coaster effect the human body?  Whatare someaffects of roller coaster rides on the human body?  What are some effets of roller coaster rides on the human body?  How do roller coasters affect the human body in different ways?  What are some affects of roller coaster rideson the human body?  If a coaster turns sharply right what does intertia do to your body?  What are some of the affects on roller coaster rides on a human body?  What are some of the effects from a roller coaster on the human body?  What are the affects on the humman body after getting off a roller coaster?