Thinking of getting one you put in the door way.. are these safe at all.?

I can't screw anything into a wall because i rent..

Nah... I used those as a kid.

They're good if you're like 120 lbs, but I don't think they'll hold up for an adult.

Sometimes the rental complexes have outside playgrounds, if you can find some monkey bars there, that might work..

wait a minute, that was a stupid suggestion.. :p

I have something like this -- It works for me. I got it at Champs.
http://the-home-gym.com/door-gym.htm

I guess there are different types of doorway chinning bars. If they're the ones that you unscrew to lengthen, with rubber pads on both ends, I think they will work for people who weigh up to around 200 pounds or so. I recently tried one and it was solid for me at about 150 pounds. I gave one to my nephew to use and he is at least 200 pounds.