Well, after a lot of thought and discussions with family/friends, I ended up taking the coordinator position. Although I am in great shape (workout 2x/week, run 3 days/week) I did have a lower back injury in my early 20's that put me out of commission for 1 month and everyone seems to think I would be tempting fate as a package handler. I really, really hate thinking it's a position I couldn't handle.
The other thing that bothers me is if I was asked to become a PT Supervisor after this assignment I think it would be better to have actually worked the position you are supervising. Also, seems like everyone on these forums dislikes the supervisors?!?!
Anyway, thank you to everyone for your responses, they were truly appreciated.