Since the door frames of the apartment I rent are very fragile, installing a pull-up bar in one of them was not an option. So this is what my husband created for me:
Don't worry this is not a window. It's the door that opens into a very nice balcony. No defenestration here.
This is how it looks from inside the room. It's made of a 3/4'' x 1 m long tube, a thick rope and a pair of felt reinforcements to prevent the tube from cutting the rope.
Detail of felt reinforcements.
The bar works very well, (I know it because P was able to do some pull-ups) but gets horribly cold in these winter nights. I hope I get to do my first pull-up without help soon.