please help me find the name of this book. I read a book when I was young, the human hero's consciousness gets transported to the mind of an alien being on a distant low-G planet. The alien being is a member of a thin, physically weak, green race (as i can remember). This Green race is dominated by a race of large, hairy, tusked beings. Given that the human hero is a soldier he takes over the body of the green alien in a attempt to fight the hairy beings. Somehow toward the end of the book the human's body is transported and reunited with his mind. Given the alien planet's low-G the human is much stronger in his newly reacquired body than the hairy aliens, despite a significant size difference. There is some kind of fight in a gladiatorial arena,(if my memory serves me right).